ci: Add Ruby 3.4 build #4302

Job	Run time
action_mailer / ubuntu-latest	11s
action_pack / ubuntu-latest	7s
action_view / ubuntu-latest	6s
active_job / ubuntu-latest	11s
active_model_serializers / ubuntu-latest	8s
active_record / ubuntu-latest	10s
active_storage / ubuntu-latest	10s
active_support / ubuntu-latest	7s
all / ubuntu-latest	6s
aws_sdk / ubuntu-latest	7s
aws_lambda / ubuntu-latest	6s
base / ubuntu-latest	10s
concurrent_ruby / ubuntu-latest	11s
delayed_job / ubuntu-latest	7s
ethon / ubuntu-latest	7s
excon / ubuntu-latest	6s
faraday / ubuntu-latest	7s
grape / ubuntu-latest	6s
graphql / ubuntu-latest	6s
grpc / ubuntu-latest	11s
gruf / ubuntu-latest	6s
http / ubuntu-latest	6s
http_client / ubuntu-latest	10s
httpx / ubuntu-latest	7s
koala / ubuntu-latest	8s
lmdb / ubuntu-latest	11s
net_http / ubuntu-latest	11s
rack / ubuntu-latest	11s
rails / ubuntu-latest	6s
restclient / ubuntu-latest	11s
rspec / ubuntu-latest	10s
sinatra / ubuntu-latest	7s
	4m 24s

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