CI: Install coveralls without --break-system-packages

ubuntu-latest doesn't seem to point to Ubuntu 24.04 anymore? Allow this to work on Ubuntu 22.04 too.

Author: peace-maker

.github/workflows/ci.yml

@@ -233,7 +233,7 @@ jobs:
 
     - name: Install coveralls
       run: |
-        pip install --break-system-packages tomli coveralls
+        pip install --break-system-packages tomli coveralls || pip install tomli coveralls
 
     - name: Upload coverage to coveralls.io
       run: |