Add uvx test case to CI

Author: zanieb

.github/workflows/ci.yml

@@ -300,6 +300,7 @@ jobs:
           Set-Alias -Name uv -Value ./target/debug/uv
           uv venv -v
           uv pip install ruff -v
+          uvx -v ruff --version
 
       - name: "Smoke test completion"
         working-directory: ${{ env.UV_WORKSPACE }}