chore: simplify bench sql script

nix/bench.sql

@@ -5,7 +5,7 @@ select
   (select error_msg from net._http_response where error_msg is not null order by id desc limit 1) as last_failure_error
 from net._http_response;
 
-create or replace procedure repro_timeouts(number_of_requests int default 10000, url text default 'http://server/post') as $$
+create or replace procedure repro_timeouts(number_of_requests int default 10000, url text default 'http://server') as $$
 declare
   last_id bigint;
   first_time timestamptz;
@@ -16,7 +16,7 @@ begin
 
   with do_requests as (
     select
-      net.http_post(url, jsonb_build_object('id', x, 'message', 'payload ' || x), headers:=jsonb_build_object('Content-Type', 'application/json')) as id
+      net.http_get(url) as id
     from generate_series (1, number_of_requests) x
   )
   select id, clock_timestamp() into last_id, first_time from do_requests offset number_of_requests - 1;