fix: missing dep install

Author: RobPasMue

.github/workflows/backwards_compatibility.yml

@@ -186,6 +186,12 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Install packages for testing
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade build wheel
+          pip install .[tests]
+
       - name: Download Geometry service container (if needed)
         env:
           FULL_IMAGE_NAME: "${{ env.ANSRV_GEO_IMAGE }}:${{ matrix.image-tag }}"