feat(workflows): remove secret we used when the repo was private (#32)

Author: Thoralf-M

.github/workflows/guidelines_enforcer.yml

@@ -21,5 +21,3 @@ jobs:
   guidelines_enforcer:
     name: Call Ledger guidelines_enforcer
     uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_guidelines_enforcer.yml@v1
-    secrets:
-      git_token: ${{ secrets.LEDGER_APP_TOKEN }}