Bump groupdate from 6.5.1 to 6.6.0 #594

Job	Run time
Lint JavaScript	19s
Lint Ruby / Run RuboCop	25s
Lint ERB / Run ErbLint	28s
Lint SCSS / Run Stylelint	19s
Security Analysis / Run Brakeman	28s
Test JavaScript / Run Jasmine	54s
Test Ruby / Run RSpec	3m 52s
	6m 45s

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