updated lint readme action

Author: stuhli

.github/workflows/lint_readme.yml

@@ -8,7 +8,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.12"
       - run: pip install codespell
       - run: codespell