Update copilot-setup-steps.yml

Standardize to python -m pip

Author: ehennestad

.github/workflows/copilot-setup-steps.yml

@@ -41,7 +41,7 @@ jobs:
       - name: Configure python env
         run: |
           python -m pip install -U pip
-          pip install -r +tests/requirements.txt
+          python -m pip install -r +tests/requirements.txt
           python -m pip list
           echo "HDF5_PLUGIN_PATH=$(python -c "import hdf5plugin; print(hdf5plugin.PLUGINS_PATH)")" >> "$GITHUB_ENV"
           echo $( python -m pip show nwbinspector | grep ^Location: | awk '{print $2}' )