Tweak load test thresholds again (#3724)

perf/load/config.js

@@ -43,7 +43,7 @@ export const options = {
   },
   thresholds: {
     http_req_failed: ["rate<0.01"],
-    http_req_duration: ["p(95)<200"],
+    http_req_duration: ["p(95)<350"],
   },
 };
 

perf/load/groups.js

@@ -44,7 +44,7 @@ export const options = {
   },
   thresholds: {
     http_req_failed: ["rate<0.01"],
-    http_req_duration: ["p(95)<300"],
+    http_req_duration: ["p(95)<400"],
   },
 };