feat!: Drop Rails 6.0 EOL #2051

Job	Run time
action_pack / ubuntu-latest	1m 39s
action_view / ubuntu-latest	1m 36s
active_job / ubuntu-latest	4m 54s
active_model_serializers / ubuntu-latest	56s
active_record / ubuntu-latest	1m 31s
active_support / ubuntu-latest	2m 35s
all / ubuntu-latest	2m 2s
aws_sdk / ubuntu-latest	7m 50s
base / ubuntu-latest	1m 15s
concurrent_ruby / ubuntu-latest	2m 41s
delayed_job / ubuntu-latest	1m 11s
ethon / ubuntu-latest	2m 20s
excon / ubuntu-latest	1m 31s
faraday / ubuntu-latest	4m 12s
grape / ubuntu-latest	4m 55s
graphql / ubuntu-latest	1m 12s
gruf / ubuntu-latest	55s
http / ubuntu-latest	1m 41s
http_client / ubuntu-latest	32s
httpx / ubuntu-latest	3m 29s
koala / ubuntu-latest	44s
lmdb / ubuntu-latest	57s
net_http / ubuntu-latest	2m 6s
rack / ubuntu-latest	1m 1s
rails / ubuntu-latest	3m 31s
restclient / ubuntu-latest	2m 10s
rspec / ubuntu-latest	1m 37s
sinatra / ubuntu-latest	2m 43s
	1h 3m 46s

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