updated gitlab-ci to install requirements before building the documentation....

I believe the problem with autodoc constructing the documentation was caused by missing dependencies. This merge request install all pyicon dependencies before attempting to build the documentation.

.gitlab-ci.yml

 pages:
   script:
   - apt-get update
-  - apt-get upgrade
+  - apt-get -y upgrade
   - apt-get -y install make
   - conda env create -f ci/requirements_py311.yml
   - source activate pyicon_py311