Merge pull request #699 from stan-dev/dependabot/github_actions/actions/checkout-4

Bump actions/checkout from 3 to 4

Author: WardBrian

.github/workflows/main.yml

@@ -49,7 +49,7 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Check out github
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4