log x-github-request-id in torngit github (#390)

we saw a strange request recently that returned a 200 but was unexpectedly missing all the rate limit headers and it took 5 seconds. seems like something might have been up with it, but we had no way to ask GH support to take a look

shared/torngit/github.py

@@ -850,6 +850,7 @@ async def make_http_call(
                         rl_limit=res.headers.get("X-RateLimit-Limit"),
                         rl_reset_time=res.headers.get("X-RateLimit-Reset"),
                         retry_after=res.headers.get("Retry-After"),
+                        gh_request_id=res.headers.get("x-github-request-id"),
                         **log_dict,
                     ),
                 )