Update git submodules
- Update extensions/Interwiki from branch 'REL1_39' to 752f9c9b330312ed1389765877f6ab238403787c
- Merge "build: Update MediaWiki requirement to 1.39.0" into REL1_39
- build: Update MediaWiki requirement to 1.39.0
Change-Id: Ib854d535d08bf0eabf36ce2e78dd7c99f6cb4f7d