DEV: Remove `bypass_bump` from CookedPostProcessor (PR #9468)

It was only passing it along to PullHotlinkedImages and that class have not used that arg since April 2014 (https://github.com/discourse/discourse/commit/c52ee665b45241a89b4de8b916860f380ecf0141)

(No plugin in all-the-plugins uses it either)

GitHub