Update git submodules
- Update extensions/SpamBlacklist from branch 'REL1_39' to 288eede6d07708a48d2e3bef33f6e9d6897effd0
- Merge "build: Update MediaWiki requirement to 1.39.0" into REL1_39
- build: Update MediaWiki requirement to 1.39.0
Change-Id: Ifa90ba88ae5b11d6140181e33adf91123d5be6da