fix: Get Rdkafka version from VERSION contant #2119

Job	Run time
action_pack / ubuntu-latest	1m 46s
action_view / ubuntu-latest	1m 37s
active_job / ubuntu-latest	3m 6s
active_model_serializers / ubuntu-latest	52s
active_record / ubuntu-latest	1m 19s
active_support / ubuntu-latest	1m 45s
all / ubuntu-latest	1m 57s
aws_sdk / ubuntu-latest	5m 27s
base / ubuntu-latest	1m 12s
concurrent_ruby / ubuntu-latest	2m 0s
delayed_job / ubuntu-latest	1m 10s
ethon / ubuntu-latest	2m 19s
excon / ubuntu-latest	1m 31s
faraday / ubuntu-latest	2m 39s
grape / ubuntu-latest	5m 3s
graphql / ubuntu-latest	1m 6s
gruf / ubuntu-latest	56s
http / ubuntu-latest	1m 6s
http_client / ubuntu-latest	35s
httpx / ubuntu-latest	2m 9s
koala / ubuntu-latest	40s
lmdb / ubuntu-latest	58s
net_http / ubuntu-latest	1m 26s
rack / ubuntu-latest	1m 6s
rails / ubuntu-latest	2m 1s
restclient / ubuntu-latest	2m 6s
rspec / ubuntu-latest	1m 12s
sinatra / ubuntu-latest	2m 12s
	51m 16s

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