⬆️ Bump actions/checkout from 5 to 6 (#56)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -33,7 +33,7 @@ jobs:
           override: true
           profile: ${{matrix.os.profile_rustup}}
       - uses: davidB/rust-cargo-make@v1
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Run tests
         run: |
           cargo make --profile "${{matrix.os.profile_ci_flow}}" ci-flow