Merge pull request #36 from beeware/dependabot/github_actions/actions/checkout-4.0.0

Bump actions/checkout from 3.6.0 to 4.0.0

Author: freakboy3742

.github/workflows/ci.yml

@@ -95,7 +95,7 @@ jobs:
             python-version: "3.11"
 
     steps:
-    - uses: actions/checkout@v3.6.0
+    - uses: actions/checkout@v4.0.0
       with:
         fetch-depth: 0