Update action.yml

Author: mgravell

.github/actions/run-tests/action.yml

@@ -29,7 +29,7 @@ runs:
       uses: actions/setup-dotnet@v4
       with:
         dotnet-version: |
-          '9.0.x'
+          9.0.x
           ${{inputs.dotnet-version}}
         dotnet-quality: 'ga'