update dotnet 9 versin in workflow

Author: wing328

.github/workflows/samples-dotnet9.yaml

@@ -43,7 +43,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: actions/setup-dotnet@v5.0.1
         with:
-          dotnet-version: '9.0.101'
+          dotnet-version: '9.0.x'
       - name: Build
         working-directory: ${{ matrix.sample }}
         run: dotnet build Org.OpenAPITools.sln

samples/client/petstore/csharp/generichost/net9/Petstore/.openapi-generator-ignore

@@ -21,3 +21,5 @@
 #docs/*.md
 # Then explicitly reverse the ignore rule for a single file:
 #!docs/README.md
+#
+#