[fix] yep engine: invcrease timeout from defaul 3sec to 5sec

In the "Engines" tab on searx.space [1] nearly all engines report a

    TimeoutException: yep engine

As documented in issue searxng#2444 [2], this problem can be fixed by increasing the
timeout. Note: on a local instance (`make run`) the timeout of 3sec was
sufficient / at least in my local test, but the balance of searx.space leads me
to believe that this tight timeout is usually not sufficient.

[1] https://searx.space/
[2] searxng#2444

Closes searxng#3421
Signed-off-by: Markus Heiser <[email protected]>

searx/settings.yml

@@ -495,6 +495,7 @@ engines:
     shortcut: yep
     categories: general
     search_type: web
+    timeout: 5
     disabled: true
 
   - name: yep images