Update rubocop requirement from ~> 1.54.0 to ~> 1.55.0 #1642

Job	Run time
lint	15s
spec (alpine-latest, 3.0)	39s
spec (alpine-latest, 3.1)	33s
spec (alpine-latest, 3.2)	29s
spec (alpine-latest, 3.3-rc)	42s
spec (macos-latest, 3.0)	44s
spec (macos-latest, 3.1)	39s
spec (macos-latest, 3.2)	37s
spec (macos-latest, 3.3)	47s
spec (macos-latest, jruby)	2m 14s
spec (macos-latest, truffleruby)	4m 44s
spec (macos-latest, truffleruby+graalvm)	7m 22s
spec (ubuntu-latest, 3.0)	18s
spec (ubuntu-latest, 3.1)	21s
spec (ubuntu-latest, 3.2)	20s
spec (ubuntu-latest, 3.3)	35s
spec (ubuntu-latest, jruby)	2m 9s
spec (ubuntu-latest, truffleruby)	1m 55s
spec (ubuntu-latest, truffleruby+graalvm)	3m 53s
spec (windows-latest, 3.0)	1m 28s
spec (windows-latest, 3.1)	2m 49s
spec (windows-latest, 3.2)	3m 18s
spec (windows-latest, jruby)	3m 22s
release	0s
	40m 13s

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