Undone version change of cdo and nco

.gitlab-ci.yml

@@ -26,7 +26,7 @@ cache:
     - conda clean -a -y
     - pip install pytest
     - conda config --set channel_priority strict
-    - conda install --override-channels --channel conda-forge -y pandoc graphviz wget zip git git-lfs cdo=2.2.2 nco=5.0.6 jq freva
+    - conda install --override-channels --channel conda-forge -y pandoc graphviz wget zip git git-lfs cdo nco jq freva
     - git lfs install
     # ensure cdo and nco are up
     - cdo --version