Update git submodules
- Update extensions/ParserFunctions from branch 'REL1_39' to 5cdead86d434a15fdcab1a535a5e3983cd59a74e
- build: Update MediaWiki requirement to 1.39.0
Change-Id: I2f1083bc62d0856e5810b28d12377b7259d5216f
- build: Update MediaWiki requirement to 1.39.0