Bump Microsoft.OpenApi from 1.6.24 to 2.1.0

---
updated-dependencies:
- dependency-name: Microsoft.OpenApi
  dependency-version: 2.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/TodoApp/TodoApp.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.8" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.8" />
     <PackageReference Include="Microsoft.Extensions.ApiDescription.Server" Version="9.0.8" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.OpenApi" Version="1.6.24" />
+    <PackageReference Include="Microsoft.OpenApi" Version="2.1.0" />
     <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="5.8.3" PrivateAssets="all" />
     <PackageReference Include="NSwag.AspNetCore" Version="14.4.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="9.0.3" />