Update git submodules
- Update extensions/ConfirmEdit from branch 'REL1_39' to 1ee3951aba7ad3667129e1d220ddf6ce4b239ca0
- Merge "build: Update MediaWiki requirement to 1.39.0" into REL1_39
- build: Update MediaWiki requirement to 1.39.0
Change-Id: I85800eab29cd5e85a3e60769061ba86cae7eb75f