ci: update runner to silence node deprecation warning

Author: edengilbertus

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: dtolnay/rust-toolchain@stable
       - run: cargo clippy -- -D warnings
       - run: cargo test