Update acts-as-taggable-on 5.0 -> 6.0
What does this MR do?
Update acts-as-taggable-on gem 5.0 -> 6.0. Only breaking change is dropping support for rails 4.
Changelog: https://github.com/mbleigh/acts-as-taggable-on/blob/master/CHANGELOG.md
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated via this MR -
Documentation reviewed by technical writer or follow-up review issue created -
Tests added for this feature/bug -
Tested in all supported browsers -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process. -
Security reports checked/validated by reviewer