Close http clients after using

The crystal http client maintains a keepalive connection to the other
server which stays alive for some time. This should be closed if the
client instance is not used again to avoid hogging resources

src/invidious/jobs/bypass_captcha_job.cr

@@ -91,6 +91,8 @@ class Invidious::Jobs::BypassCaptchaJob < Invidious::Jobs::BaseJob
               },
             }.to_json).body)
 
+            captcha_client.close
+
             raise response["error"].as_s if response["error"]?
             task_id = response["taskId"].as_i