Increase action version to eliminate Node warning

Author: nseidle

.github/workflows/mkdocs.yml

@@ -7,8 +7,8 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
         with:
           python-version: 3.x
       - run: pip install mkdocs-material mkdocs-monorepo-plugin