nix(loadtest): run more requests in jwt-cache test

We don't need to restrict us to run every request once. Instead we can
run as many as possible within 60s by removing the `-lazy` flag.

This also allows us to generate fewer targets, because vegeta will do
the repetition for us.

nix/tools/loadtest.nix

@@ -73,7 +73,7 @@ let
             ${withTools.withPg} -f "$_arg_testdir"/fixtures.sql \
             ${withTools.withPgrst} --faketime '2000-01-01 00:00:00' -m "$_arg_monitor" \
             sh -c "cd \"$_arg_testdir\" && \
-            ${runner} -lazy -targets gen_targets.http -output \"$abs_output\" \"''${_arg_leftovers[@]}\""
+            ${runner} -targets gen_targets.http -output \"$abs_output\" \"''${_arg_leftovers[@]}\""
             ;;
 
           # here we sleep purposefully to check how much memory does the schema cache consume in the final report