chore(deps): update actions/checkout action to v6 (#547)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/update-ffi.yml

@@ -9,7 +9,7 @@ jobs:
   update:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - run: |
         git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"