typo correction

Author: Ugbe

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: '9.0.x'
+        dotnet-version: '9.0'
 
     - name: Restore dependencies
       run: dotnet restore RubberSearch.sln