Potential fix for code scanning alert no. 266: Checkout of untrusted code in trusted context

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: joel-rieke

.github/workflows/format.yml

@@ -58,8 +58,6 @@ jobs:
           go-version: ^1.19
         id: go
       - uses: actions/checkout@v3
-        with:
-          ref: ${{ github.head_ref }}
       - name: Check all
         id: check_format
         run: |