chore: Update dependency SixLabors.ImageSharp to 3.1.12

Author: renovate[bot]

src/Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="PolySharp" Version="1.15.0" />
     <PackageVersion Include="Roslynator.Analyzers" PrivateAssets="All" Version="4.14.1" />
     <PackageVersion Include="Shouldly" Version="4.3.0" />
-    <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.11" />
+    <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.12" />
     <PackageVersion Include="Spectre.Verify.Extensions" Version="28.16.0" />
     <PackageVersion Include="StyleCop.Analyzers" PrivateAssets="All" Version="1.2.0-beta.556" />
     <PackageVersion Include="System.Memory" Version="4.6.3" />