CI: workaround syntax error in azure lib (#29618)

.github/workflows/selfdrive_tests.yaml

@@ -317,7 +317,7 @@ jobs:
     - name: Upload reference logs
       if: ${{ failure() && steps.print-diff.outcome == 'success' && github.repository == 'commaai/openpilot' && env.AZURE_TOKEN != '' }}
       run: |
-        ${{ env.RUN }} "CI=1 AZURE_TOKEN='$AZURE_TOKEN' python selfdrive/test/process_replay/test_processes.py -j$(nproc) --upload-only"
+        ${{ env.RUN }} "unset PYTHONWARNINGS && CI=1 AZURE_TOKEN='$AZURE_TOKEN' python selfdrive/test/process_replay/test_processes.py -j$(nproc) --upload-only"
     - name: "Upload coverage to Codecov"
       uses: codecov/codecov-action@v3