Bump go-github to id workflow_job header
Created by: daxmc99
Excessive logging in sg managed instances when we recieve workflow_run events come in from customer workflows
sample
t=2022-04-11T17:41:35+0000 lvl=eror msg="Error parsing github webhook event" error="unknown X-Github-Event in message: workflow_job"
t=2022-04-11T17:41:37+0000 lvl=eror msg="Error parsing github webhook event" error="unknown X-Github-Event in message: workflow_job"
Test plan
Minor change that only affects 3 library calls gh.WebHookType gh.ParseWebHook gh.ValidateSignature