chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build-test.yml

@@ -260,7 +260,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@nightly