Bump Microsoft.AspNetCore.OpenApi from 8.0.18 to 8.0.19

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-version: 8.0.19
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -17,7 +17,7 @@
     <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="9.0.7" />
   </ItemGroup>
   <ItemGroup Label="Samples">
-    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="8.0.18" />
+    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="8.0.19" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="9.0.8" />
     <PackageVersion Include="Swashbuckle.AspNetCore" Version="9.0.3" />
   </ItemGroup>