Bump Microsoft.AspNetCore.OpenApi from 8.0.13 to 8.0.15 (#648)

Bumps [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore) from 8.0.13 to 8.0.15.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v8.0.13...v8.0.15)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-version: 8.0.15
  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

@@ -27,7 +27,7 @@
     <PackageVersion Include="Dapr.AspNetCore" Version="1.15.2" />
     <PackageVersion Include="Dapr.Client" Version="1.15.2" />
     <PackageVersion Include="Microsoft.AspNetCore.Components.QuickGrid" Version="$(AspNetCoreVersion)" />
-    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="8.0.13" />
+    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="8.0.15" />
     <PackageVersion Include="Microsoft.DotNet.PlatformAbstractions" Version="3.1.6" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.4">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>