build(air): update checkout version for Node.js 24

Author: andybeet

.github/workflows/format-check.yaml

@@ -14,7 +14,7 @@ jobs:
     name: format-check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install
         uses: posit-dev/setup-air@v1