Remove --break-system-packages flag and add comment about version pins

Co-authored-by: ShreckYe <27768951+ShreckYe@users.noreply.github.com>

Author: Copilot

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

@@ -39,7 +39,8 @@ jobs:
       - name: Install Python dependencies
         run: |
           # Install Python packages needed by the toolset
-          pip3 install --break-system-packages \
+          # Version pins match Dockerfile for consistency
+          pip3 install \
             docker==7.0.0 \
             mysqlclient==2.2.4 \
             pymongo==4.7.2