IGNITE-24807 Remove outdated allow_force_pushes flag in .asf.yaml (#11948)

Force pushes are disabled for all protected branches, `allow_force_pushes` flag no longer exists

(see https://github.com/apache/infrastructure-asfyaml for more details)

Author: ptupitsyn

.asf.yaml

@@ -38,11 +38,11 @@ github:
     projects: false
   enabled_merge_buttons:
     squash:  true
+    squash_commit_message: PR_TITLE_AND_DESC
     merge:   false
     rebase:  false
   protected_branches:
     master:
-      allow_force_pushes: false
       required_linear_history: true
       required_signatures: false