Fix workflow

Author: ufechner7

.github/workflows/CI.yml

@@ -24,13 +24,16 @@ jobs:
       matrix:
         version:
           - '1.11'
-          - '1.6'
+          - '1.10'
           - 'pre'
         os:
           - ubuntu-latest
         arch:
           - x64
     steps:
+      - name: Install matplotlib
+        run: if [ "$RUNNER_OS" = "Linux" ]; then sudo apt-get install -y python3-matplotlib; export PYTHON=$PYTHON_PATH; fi
+        shell: bash
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v2
         with: