Merge pull request JuliaPy#549 from JuliaPy/dependabot/github_actions/actions/checkout-4

Bump actions/checkout from 2 to 4

Author: MilesCranmer

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
   publish-to-testpypi:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Python 3.9
         uses: actions/setup-python@v4
         with: