chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/rust.yml

@@ -20,7 +20,7 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build
       run: cargo build --verbose
     - name: Run tests