Upgrade GitHub actions & pin to commit hash (#2598)

* Upgrade GitHub actions & pin to commit hash

The only exception is `google/oss-fuzz` which does not seem to have releases
or Git tags, so pinning might not make sense there.

Also adds `actions/setup-java` to the `codeql-analysis` workflow to
explicitly specify the JDK version to use (and to use the caching of
that action) instead of relying on the default JDK of the runner image.

* Enable Dependabot for GitHub actions

---------

Co-authored-by: Éamonn McManus <emcmanus@google.com>

.github/dependabot.yml

@@ -4,3 +4,8 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/build.yml

@@ -19,9 +19,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
       - name: "Set up JDK ${{ matrix.java }}"
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93  # v4.0.0
         with:
           distribution: 'temurin'
           java-version: ${{ matrix.java }}
@@ -35,9 +35,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
       - name: "Set up GraalVM"
-        uses: graalvm/setup-graalvm@v1
+        uses: graalvm/setup-graalvm@b8dc5fccfbc65b21dd26e8341e7b21c86547f61b  # v1.1.5.1
         with:
           java-version: '17'
           distribution: 'graalvm'
@@ -54,9 +54,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
       - name: "Set up JDK 17"
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93  # v4.0.0
         with:
           distribution: 'temurin'
           java-version: 17

.github/workflows/check-android-compatibility.yml

@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
 
       - name: Set up JDK 11
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93  # v4.0.0
         with:
           distribution: 'temurin'
           java-version: '11'

.github/workflows/check-api-compatibility.yml

@@ -10,13 +10,13 @@ jobs:
 
     steps:
       - name: Checkout old version
-        uses: actions/checkout@v3
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
         with:
           ref: ${{ github.event.pull_request.base.sha }}
           path: 'gson-old-japicmp'
 
       - name: Set up JDK 11
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93  # v4.0.0
         with:
           distribution: 'temurin'
           java-version: '11'
@@ -31,7 +31,7 @@ jobs:
           mvn --batch-mode --no-transfer-progress install -DskipTests
 
       - name: Checkout new version
-        uses: actions/checkout@v3
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
 
       - name: Check API compatibility
         id: check-compatibility
@@ -39,7 +39,7 @@ jobs:
           mvn --batch-mode --fail-at-end --no-transfer-progress package japicmp:cmp -DskipTests
 
       - name: Upload API differences artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@1eb3cb2b3e0f29609092a73eb033bb759a334595  # v4.1.0
         # Run on workflow success (in that case differences report might include added methods and classes)
         # or when API compatibility check failed
         if: success() || ( failure() && steps.check-compatibility.outcome == 'failure' )

.github/workflows/cifuzz.yml

@@ -18,7 +18,7 @@ jobs:
         fuzz-seconds: 600
         dry-run: false
     - name: Upload Crash
-      uses: actions/upload-artifact@v1
+      uses: actions/upload-artifact@1eb3cb2b3e0f29609092a73eb033bb759a334595  # v4.1.0
       if: failure() && steps.build.outcome == 'success'
       with:
         name: artifacts

.github/workflows/codeql-analysis.yml

@@ -25,24 +25,23 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93  # v4.0.0
+      with:
+        distribution: 'temurin'
+        java-version: '17'
+        cache: 'maven'
 
     # Initializes the CodeQL tools for scanning
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@e5f05b81d5b6ff8cfa111c80c22c5fd02a384118  # v3.23.0
       with:
         languages: ${{ matrix.language }}
         # Run all security queries and maintainability and reliability queries
         queries: +security-and-quality
 
-    - name: Cache local Maven repository
-      uses: actions/cache@v3
-      with:
-        path: ~/.m2/repository
-        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-        restore-keys: |
-          ${{ runner.os }}-maven-
-
     # Only compile main sources, but ignore test sources because findings for them might not
     # be that relevant (though GitHub security view also allows filtering by source type)
     # Can replace this with github/codeql-action/autobuild action to run complete build
@@ -51,4 +50,4 @@ jobs:
         mvn compile --batch-mode --no-transfer-progress
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@e5f05b81d5b6ff8cfa111c80c22c5fd02a384118  # v3.23.0