Removed intermediate installation of pytest + plugins.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

.gitlab-ci.yml

@@ -13,8 +13,6 @@ test_arosics:
   script:
     - source /root/mambaforge/bin/activate ci_env
 
-    - pip install pytest pytest-cov pytest-reporter-html1  # TODO remove after recreating CI runner
-
     # update py_tools_ds and geoarray
     - pip install -U py_tools_ds -q
     - pip install -U geoarray -q