Bump Microsoft.AspNetCore.OpenApi from 8.0.11 to 8.0.12

Bumps [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore) from 8.0.11 to 8.0.12.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v8.0.11...v8.0.12)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/TestApi/TestApi.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.11" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.12" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="7.2.0" />
   </ItemGroup>