Update git submodules
- Update extensions/TextExtracts from branch 'REL1_39' to 0e13404fb2a847956cf54d02d60ff15b56ab4454
- build: Update MediaWiki requirement to 1.39.0
Change-Id: I0b35b7902b91f482c449b3460407459bd926a5a6
- build: Update MediaWiki requirement to 1.39.0