update dotnet 9 versin in workflow (#22566)

* update dotnet 9 versin in workflow

* revert

Author: wing328

.github/workflows/samples-dotnet9.yaml

@@ -43,7 +43,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: actions/[email protected]
         with:
-          dotnet-version: '9.0.101'
+          dotnet-version: '9.0.x'
       - name: Build
         working-directory: ${{ matrix.sample }}
         run: dotnet build Org.OpenAPITools.sln