Update git submodules
- Update AdvancedSearch from branch 'master' to 286a93ee4aad8dbb300b7222b021803f26c53afc
- Merge "Add test for uncovered SearchnamespaceTokenModule"
- Add test for uncovered SearchnamespaceTokenModule
Trivial, very fast test to raise the coverage at https://doc.wikimedia.org/cover-extensions/AdvancedSearch/