Bump System.Drawing.Common from 6.0.0 to 8.0.4

Bumps [System.Drawing.Common](https://github.com/dotnet/winforms) from 6.0.0 to 8.0.4.
- [Release notes](https://github.com/dotnet/winforms/releases)
- [Changelog](https://github.com/dotnet/winforms/blob/main/docs/release-activity.md)
- [Commits](https://github.com/dotnet/winforms/commits/v8.0.4)

---
updated-dependencies:
- dependency-name: System.Drawing.Common
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

UnityAssetReplacer/UnityAssetReplacer.csproj

@@ -48,7 +48,7 @@
     <PackageReference Include="Mono.Options">
       <Version>6.12.0.148</Version>
     </PackageReference>
-    <PackageReference Include="System.Drawing.Common" Version="6.0.0" />
+    <PackageReference Include="System.Drawing.Common" Version="8.0.4" />
   </ItemGroup>
   <ItemGroup>
     <None Include="..\LICENSE">