Bump rubocop-rails from 2.27.0 to 2.28.0 in the rubocop group #3152

Job	Run time
build	2m 46s
Linting: Standardjs	38s
Linting: Rubocop	47s
Security: Brakeman	39s
Unit tests: RSpec	3m 26s
Linting: YAML through prettier	51s
Integration tests: admin / Cucumber job	2m 14s
Integration tests: dgfip habilitations / Cucumber job	4m 29s
Integration tests: other habilitations / Cucumber job	4m 2s
Integration tests: others / Cucumber job	3m 10s
Merge develop with main	0s
Continuous deployment on staging	0s
	23m 2s

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