remove --data-file

Author: tcompa

.github/workflows/ci_poetry.yml

@@ -146,7 +146,7 @@ jobs:
         # We added this step to replace the variable `MERGE_COVERAGE_FILES: true`
         # in the next step, which had started to raise errors
         # (https://github.com/fractal-analytics-platform/fractal-server/pull/1725).
-        run: poetry run coverage combine coverage-data-* --data-file=fractal_tasks_core/.coverage
+        run: poetry run coverage combine coverage-data-*
 
       - run: rm -r .venv