Bump gds-api-adapters to 11.6.0

This includes support for the 'sort' parameter when requesting tags from
the Content API.
Sort subsector tags in alphabetical order

This changes the SpecialistSectorsController to include a sort option
when requesting child tags for a sector, so that the subsectors are
sorted in alphabetical order.
Merge pull request #8 from alphagov/sort-sectors-alphabetically

Sort child sector tags in alphabetical order