Bump SixLabors.ImageSharp from 3.1.11 to 3.1.12 (#327)

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-version: 3.1.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="NUnit3TestAdapter" Version="5.2.0" />
     <PackageVersion Include="Polyfill" Version="8.9.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.162" />
-    <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.11" />
+    <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.12" />
     <PackageVersion Include="Verify" Version="31.2.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
     <PackageVersion Include="Verify.NUnit" Version="31.2.0" />