fix(db): use engine.begin() to commit cntrb_id updates in update_issue_closed_cntrbs_by_repo_id#3801

mn-ram wants to merge 1 commit intoaugurlabs:mainaugurlabs/augur:mainfrom

mn-ram:fix/issue-3457-commit-cntrb-update-transactionmn-ram/augur:fix/issue-3457-commit-cntrb-update-transactionCopy head branch name to clipboard