build: remove unnecessary SHA reference

Author: BBeltz1

.github/workflows/format-suggest.yaml

@@ -16,8 +16,6 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-        with:
-          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Install
         uses: posit-dev/setup-air@v1