Secure testing is done with pymodbus in PR. (#2136)

Author: janiversen

.github/workflows/ci.yml

@@ -73,7 +73,7 @@ jobs:
         run: |
           python -m venv ${{ env.VIRTUAL_ENV }}
           python -m pip install --upgrade pip
-          pip install ".[all]"
+          pip install -e ".[all]"
 
       - name: codespell
         if: matrix.run_doc == true