Update git submodules
- Update extensions/SyntaxHighlight_GeSHi from branch 'REL1_39' to d1addca20d3bb171178af0a77ee73553ee66cb16
- build: Update MediaWiki requirement to 1.39.0
Change-Id: I20feff254dfd5438818b9428a4afdd7994e8d435
- build: Update MediaWiki requirement to 1.39.0