Update environment.yml

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Collecting https://gricad-gitlab.univ-grenoble-alpes.fr/mecaiceige/tools/lib_python/xarray_aita (from -r /builds/mecaiceige/tools/documentations/AITA-book/condaenv.t5_5asqs.requirements.txt (line 1))
Downloading https://gricad-gitlab.univ-grenoble-alpes.fr/mecaiceige/tools/lib_python/xarray_aita

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CondaEnvException: Pip failed

Cleaning up file based variables
ERROR: Job failed: exit code 1