[IMP] Do not create milestone branch when merging PR

Co-authored-by: Stéphane Bidoul <stephane.bidoul@acsone.eu>

src/oca_github_bot/tasks/merge_bot.py

@@ -27,11 +27,7 @@
 from ..utils import hide_secrets
 from ..version_branch import make_merge_bot_branch, parse_merge_bot_branch
 from .main_branch_bot import main_branch_bot_actions
-from .migration_issue_bot import (
-    _check_line_issue,
-    _create_or_find_branch_milestone,
-    _find_issue,
-)
+from .migration_issue_bot import _find_issue, mark_migration_line_done
 
 _logger = getLogger(__name__)
 
@@ -208,8 +204,7 @@ def _merge_bot_merge_pr(org, repo, merge_bot_branch, cwd, dry_run=False):
         github.gh_call(gh_pr.close)
 
         # Check line in migration issue if required
-        milestone = _create_or_find_branch_milestone(gh_repo, target_branch)
-        migration_issue = _find_issue(gh_repo, milestone, target_branch)
+        migration_issue = _find_issue(gh_repo, target_branch)
         if migration_issue:
             new_body = _check_line_issue(gh_pr.number, migration_issue.body)
             migration_issue.edit(body=new_body)