ci: checkoutv4

Author: piprett

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
     name: Build & Test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
       - run: cargo build --verbose
       - run: cargo test --verbose