Update git submodules
- Update extensions/ReplaceText from branch 'REL1_39' to cba3752f5cfa713ce7fc019fa12fcb43e67d8a34
- build: Update MediaWiki requirement to 1.39.0
Change-Id: I7621b314b96f6276887793b0c7f08586750740bb
- build: Update MediaWiki requirement to 1.39.0