fix merge_stage_test

Author: Ben-Louis

.github/workflows/merge_stage_test.yml

@@ -220,6 +220,7 @@ jobs:
           python -m pip install -r requirements/poseval.txt
       - name: Build and install
         run: |
+          python -m pip install --upgrade pip setuptools wheel
           python -m pip install -e . -v
       - name: Run unittests and generate coverage report
         run: |