Update gitlab CI

Author: kulbachcedric

.github/workflows/mkdocs.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: 3.11.9
 
       - run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain=nightly --profile=minimal -y && rustup show
         if: matrix.os == 'ubuntu-latest'

.github/workflows/unit-tests.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ['3.9', '3.10', '3.11']
+        python: ['3.10', '3.11']
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps: