ci: Add Ruby 3.4 build #4296

Job	Run time
action_mailer / ubuntu-latest	10s
action_pack / ubuntu-latest	13s
action_view / ubuntu-latest	10s
active_job / ubuntu-latest	10s
active_model_serializers / ubuntu-latest	11s
active_record / ubuntu-latest	10s
active_storage / ubuntu-latest	10s
active_support / ubuntu-latest	13s
all / ubuntu-latest	11s
aws_sdk / ubuntu-latest	10s
aws_lambda / ubuntu-latest	13s
base / ubuntu-latest	9s
concurrent_ruby / ubuntu-latest	10s
delayed_job / ubuntu-latest	12s
ethon / ubuntu-latest	12s
excon / ubuntu-latest	10s
faraday / ubuntu-latest	10s
grape / ubuntu-latest	12s
graphql / ubuntu-latest	10s
grpc / ubuntu-latest	10s
gruf / ubuntu-latest	10s
http / ubuntu-latest	10s
http_client / ubuntu-latest	9s
httpx / ubuntu-latest	11s
koala / ubuntu-latest	12s
lmdb / ubuntu-latest	7s
net_http / ubuntu-latest	10s
rack / ubuntu-latest	10s
rails / ubuntu-latest	8s
restclient / ubuntu-latest	11s
rspec / ubuntu-latest	10s
sinatra / ubuntu-latest	10s
	5m 34s

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