Bump Microsoft.AspNetCore.OpenApi from 10.0.7 to 10.0.9 (#83)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.OpenApi
  dependency-version: 10.0.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

Directory.Packages.props

@@ -7,7 +7,7 @@
 
   <!-- ASP.NET Core Dependencies -->
   <ItemGroup Label="ASP.NET Core">
-    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.7" />
+    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.9" />
     <!-- Pin to patched version to avoid CVE-2026-49451 (stack overflow on circular schema refs). -->
     <PackageVersion Include="Microsoft.OpenApi" Version="2.7.5" />
     <PackageVersion Include="Microsoft.Extensions.Http" Version="10.0.7" />