Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 1.0.0-beta0007 to 1.0.0-rc0001. - [Release notes](https://github.com/SixLabors/ImageSharp/releases) - [Commits](https://github.com/SixLabors/ImageSharp/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>