feat!: Drop Rails 6.0 EOL #2036

Job	Run time
action_pack / ubuntu-latest	1m 36s
action_view / ubuntu-latest	1m 35s
active_job / ubuntu-latest	4m 15s
active_model_serializers / ubuntu-latest	1m 22s
active_record / ubuntu-latest	1m 33s
active_support / ubuntu-latest	1m 54s
all / ubuntu-latest	1m 54s
aws_sdk / ubuntu-latest	6m 34s
base / ubuntu-latest	2m 14s
concurrent_ruby / ubuntu-latest	2m 29s
delayed_job / ubuntu-latest	1m 17s
ethon / ubuntu-latest	2m 17s
excon / ubuntu-latest	1m 26s
faraday / ubuntu-latest	4m 20s
grape / ubuntu-latest	4m 57s
graphql / ubuntu-latest	1m 5s
gruf / ubuntu-latest	58s
http / ubuntu-latest	1m 30s
http_client / ubuntu-latest	31s
httpx / ubuntu-latest	3m 20s
koala / ubuntu-latest	51s
lmdb / ubuntu-latest	1m 6s
net_http / ubuntu-latest	1m 58s
rack / ubuntu-latest	1m 4s
rails / ubuntu-latest	3m 11s
restclient / ubuntu-latest	3m 11s
rspec / ubuntu-latest	1m 58s
sinatra / ubuntu-latest	2m 48s
	1h 3m 14s

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