Update git submodules
- Update extensions/Renameuser from branch 'REL1_39' to 86810e34824d6e950a5d5b844dc5f1368ced005b
- build: Update MediaWiki requirement to 1.39.0
Change-Id: Ibbd428497fdd62c3c7b06be42659a5c11689a3d9
- build: Update MediaWiki requirement to 1.39.0