chore: Bump rubocop-performance 1.20 #2255

Job	Run time
mysql / mysql2 / ubuntu-latest	1m 8s
kafka / racecar / ubuntu-latest	9m 38s
mysql / trilogy / ubuntu-latest	1m 0s
postgresql / pg / ubuntu-latest	2m 22s
kafka / rdkafka / ubuntu-latest	11m 41s
postgresql / que / ubuntu-latest	1m 29s
kafka / ruby_kafka / ubuntu-latest	4m 19s
rabbitmq / bunny / ubuntu-latest	42s
other / dalli / ubuntu-latest	2m 19s
redis / redis / ubuntu-latest	1m 37s
other / mongo / ubuntu-latest	1m 56s
redis / resque / ubuntu-latest	1m 24s
redis / sidekiq / ubuntu-latest	4m 31s
	44m 6s

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