use dev dependencies to check coverage

.gitlab-ci.yml

@@ -23,7 +23,7 @@ cov:
   needs: []
   image: python:3.12-slim
   script:
-    - pip3 install -r requirements.txt
+    - pip3 install -r requirements-dev.txt
     - coverage run --source='.' runtests.py
     - coverage report
   coverage: '/TOTAL.+ ([0-9]{1,3}%)/'

requirements-dev.txt

+-r requirements.txt
 setuptools>=62.6
 twine
 black~=25.1.0