Bump SixLabors.ImageSharp from 3.1.11 to 3.1.12

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

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

Author: dependabot[bot]

lib/Ephemerality.Unpack/Ephemerality.Unpack.csproj

@@ -20,7 +20,7 @@ Content can be unpacked in the form of RAWML for Mobi/AZW3 and plain text for KF
     <ItemGroup>
         <PackageReference Include="JetBrains.Annotations" Version="2025.2.2" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-        <PackageReference Include="SixLabors.ImageSharp" Version="3.1.11" />
+        <PackageReference Include="SixLabors.ImageSharp" Version="3.1.12" />
         <PackageReference Include="System.Memory" Version="4.6.3" />
     </ItemGroup>