Added conda and Python update to test_geoarray_install.

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

.gitlab-ci.yml

@@ -52,6 +52,10 @@ test_geoarray_install:
     - conda create -y -q --name geoarray_testinstall python=3
     - source activate geoarray_testinstall
 
+    # update conda and python
+    - conda update -n base -c defaults conda
+    - conda update -c conda-forge python
+
     # avoid package incompatibilities due to usage of wrong channels
     - conda config --set channel_priority strict  # otherwise gdal or libgdal may be installed from defaults channel