update mkdocs deploy

Author: vincentsarago

.github/workflows/deploy_mkdocs.yml

@@ -17,12 +17,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout main
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Install dependencies
         run: |