Fix maicos Pipeline (#102)

Author: hejamu

mdakits/maicos/metadata.yaml

@@ -24,7 +24,7 @@ python_requires: ">=3.9"
 mdanalysis_requires: ">=2.5.0"
 run_tests:
   - git clone latest
-  - tox -e py39-tests
+  - tox -e tests
 test_dependencies:
   - pip install tox
 development_status: Beta