Bump Microsoft.AspNetCore.OpenApi from 7.0.8 to 7.0.9

Bumps [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore) from 7.0.8 to 7.0.9.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v7.0.8...v7.0.9)

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

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

Author: dependabot[bot]

src/NTorSpectator.Observer/NTorSpectator.Observer.csproj

@@ -10,7 +10,7 @@
     <ItemGroup>
         <PackageReference Include="AspNetCore.HealthChecks.System" Version="6.0.5" />
         <PackageReference Include="AspNetCore.HealthChecks.Uris" Version="6.0.3" />
-        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="7.0.8" />
+        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="7.0.9" />
         <PackageReference Include="NeoSmart.AsyncLock" Version="3.2.1" />
         <PackageReference Include="prometheus-net.AspNetCore" Version="8.0.0" />
         <PackageReference Include="Quartz.AspNetCore" Version="3.6.2" />