Merge pull request #1 from cwoffenden/dependabot/github_actions/actions/checkout-4

Bump actions/checkout from 3 to 4

Author: cwoffenden

.github/workflows/mypy.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install Python
       uses: actions/setup-python@v4