Merge pull request #27 from astro/renovate/actions-checkout-4.x

Update actions/checkout action to v4

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - name: Dependencies
       run: sudo apt-get install -y libsystemd-dev
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build
       run: cargo build --verbose
     - name: Run tests