Bump SixLabors.ImageSharp from 3.1.4 to 3.1.5 in /Refresh.GameServer

Bumps [SixLabors.ImageSharp](https://github.com/SixLabors/ImageSharp) from 3.1.4 to 3.1.5.
- [Release notes](https://github.com/SixLabors/ImageSharp/releases)
- [Commits](SixLabors/ImageSharp@v3.1.4...v3.1.5)

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-type: direct:production
...

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

Refresh.GameServer/Refresh.GameServer.csproj

@@ -73,7 +73,7 @@
       <PackageReference Include="Pfim" Version="0.11.2" />
       <PackageReference Include="Realm" Version="12.2.0" />
       <PackageReference Include="SharpZipLib" Version="1.4.2" />
-      <PackageReference Include="SixLabors.ImageSharp" Version="3.1.4" />
+      <PackageReference Include="SixLabors.ImageSharp" Version="3.1.5" />
       <PackageReference Include="EasyHotReload" Version="1.0.0" />
     </ItemGroup>