add conda update

.github/workflows/CI.yml

@@ -391,11 +391,11 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt install -y libopenmpi-dev openmpi-bin
+          conda update conda
           python -m pip install --upgrade pip
           pip install -r requirements/requirements-docs.txt
           pip install -r requirements/requirements-tutorials.txt
           conda config --add channels conda-forge # bugfix with scipy==1.8.1: libstdcxx-ng 12.1.0 required
-          conda update conda
           conda install -c conda-forge gcc=12.1.0
           conda env update --file requirements/environment-docs.yml --name base
           conda install -c conda-forge openmpi