fix pip enviroment.

Author: MFraters

.github/workflows/test.yml

@@ -286,7 +286,7 @@ jobs:
         run: echo $PATH && export PATH=$PATH:/home/runner/.local/bin && echo $PATH && export PYTHONPATH=$PYTHONPATH:/home/runner/.local/bin
 
       - name: Install coveralls
-        run: pip install --user cpp-coveralls 
+        run: pipx install cpp-coveralls 
         shell: bash
 
       - name: Create Build Environment