build(deps): bump Microsoft.AspNetCore.OpenApi from 8.0.3 to 8.0.4 (#6)

Bumps [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore) from 8.0.3 to 8.0.4.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v8.0.3...v8.0.4)

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

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

RateLimitDotNet/RateLimitDotNet.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.3" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.4" />
     <PackageReference Include="Microsoft.AspNetCore.RateLimiting" Version="7.0.0-rc.2.22476.2" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.5.0" />
     <PackageReference Include="System.Threading.RateLimiting" Version="8.0.0" />