Bump Microsoft.AspNetCore.OpenApi in the aspnetcore group

Bumps the aspnetcore group with 1 update: [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore).


Updates `Microsoft.AspNetCore.OpenApi` 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
  dependency-group: aspnetcore
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

samples/Sample.Middleware/Sample.Middleware.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.3" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.4" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="8.1.1" />
   </ItemGroup>
 

samples/Sample.MinimalApi/Sample.MinimalApi.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.3" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.4" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="8.1.1" />
   </ItemGroup>