feat!: Drop Rails 6.0 EOL #2049

Job	Run time
mysql / mysql2 / ubuntu-latest	1m 1s
kafka / racecar / ubuntu-latest	11m 49s
mysql / trilogy / ubuntu-latest	1m 26s
kafka / rdkafka / ubuntu-latest	10m 3s
kafka / ruby_kafka / ubuntu-latest	5m 17s
rabbitmq / bunny / ubuntu-latest	55s
postgresql / pg / ubuntu-latest	3m 26s
redis / redis / ubuntu-latest	1m 56s
postgresql / que / ubuntu-latest	2m 2s
other / dalli / ubuntu-latest	2m 12s
redis / resque / ubuntu-latest	1m 25s
other / mongo / ubuntu-latest	2m 3s
redis / sidekiq / ubuntu-latest	5m 31s
	49m 6s

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