tests pass
update to new utils hash
responding to review changes
Merge pull request #1120 from davecheney/213-set-strings-refactor

all: update dependencies.tsv and callers to set.Strings change

Update all uses of set.Strings, for #86/#87 from juju/utils

TODOs will be addressed in a followup PR

There are no uses of `set.Tags` in the codebase.