Update git submodules
- Update extensions/TemplateData from branch 'REL1_39' to 528caa6e1f6b29c6fd10380ac003812bff9fad6c
- Merge "build: Update MediaWiki requirement to 1.39.0" into REL1_39
- build: Update MediaWiki requirement to 1.39.0
Change-Id: Ie82c77bbe6bc7e60c08106f12990451c189e8f57