Bump SixLabors.ImageSharp from 3.1.7 to 3.1.8

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 3.1.7 to 3.1.8.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v3.1.7...v3.1.8)

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-version: 3.1.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

GithubActionsHelloWorld/GithubActionsHelloWorld.csproj

@@ -20,7 +20,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="SixLabors.ImageSharp" Version="3.1.7" />
+		<PackageReference Include="SixLabors.ImageSharp" Version="3.1.8" />
 		<PackageReference Include="ZXing.Net" Version="0.16.10" />
 	</ItemGroup>