We're upgrading to MediaWiki version 1.39, but the REL1_39 version of the AccessControl gives 2.6 as version (Special:Version-page and extension.json). REL1_40 gives 6.0. Version 2.6 is completely outdated.
I used: git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/AccessControl
How do I get the right version?