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Modernize RuboCop configuration and fix offenses #1180

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Job	Run time
linting	19s
build 3.0	37s
build 3.3	41s
build 4.0	36s
build 3.4	43s
build 3.2	46s
build 3.1	40s
build head	32s
build truffleruby-head	1m 34s
	6m 28s