ci: disable parallel tests to fix missing modules

Author: linuxdaemon

.github/workflows/python-tests.yml

@@ -46,4 +46,4 @@ jobs:
         SKIP: nitpick
 
     - name: Run tests
-      run: hatch test --python ${{ matrix.python-version }} --cover --randomize --parallel --retries 2 --retry-delay 1
+      run: hatch test --python ${{ matrix.python-version }} --cover --randomize --retries 2 --retry-delay 1