Update extensions not to use deprecated EditPageBeforeEditChecks hook.
The hook was deprecated in https://gerrit.wikimedia.org/r/#/c/344805/ (MW 1.29).
Use 'EditPageGetCheckboxesDefinition' instead, or 'EditPage::showStandardInputs:options' if you don't actually care about checkboxes and just want to add some HTML to the page.
extensions/FlaggedRevs/FlaggedRevs.php: 561: $wgHooks['EditPageBeforeEditChecks'][] = 'FlaggedRevsUIHooks::addReviewCheck'; extensions/LiquidThreads/extension.json: 300: "EditPageBeforeEditChecks": [ extensions/Pickle/extension.json: 342: "EditPageBeforeEditChecks": [ extensions/Scribunto/Scribunto.php: 73: $wgHooks['EditPageBeforeEditChecks'][] = 'ScribuntoHooks::beforeEditChecks'; extensions/TweetANew/TweetANew.php: 207: $wgHooks['EditPageBeforeEditChecks'][] = 'efTweetANewEditCheckBox'; extensions/Wikibase/client/WikibaseClient.php: 132: $wgHooks['EditPageBeforeEditChecks'][] = '\Wikibase\ClientHooks::onEditAction';