Try installing psutil in venv

Author: ldionne

.github/workflows/libcxx-build-and-test.yaml

@@ -207,6 +207,8 @@ jobs:
       - uses: seanmiddleditch/gha-setup-ninja@master
       - name: Build and test
         run: |
+          python3 -m venv .venv
+          source .venv/bin/activate
           python3 -m pip install psutil
           bash libcxx/utils/ci/run-buildbot ${{ matrix.config }}
       - uses: actions/upload-artifact@26f96dfa697d77e81fd5907df203aa23a56210a8 # v4.3.0