Bump Microsoft.AspNetCore.OpenApi from 9.0.3 to 9.0.4 (#8)

Bumps [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore) from 9.0.3 to 9.0.4.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v9.0.3...v9.0.4)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-version: 9.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -21,6 +21,6 @@
   </ItemGroup>
   <ItemGroup Label="ASP.NET Core">
     <PackageVersion Include="Swashbuckle.AspNetCore.Swagger" Version="8.1.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="9.0.3" />
+    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="9.0.4" />
   </ItemGroup>
 </Project>