Change PR healthkeeper evergreen job timeout to 6h (360 minutes)

Agent-Logs-Url: https://github.com/githubnext/tsessebe/sessions/459137d1-cfbb-4070-93d1-483bdb4cb9a4

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

Author: Copilot

.github/workflows/evergreen.lock.yml

@@ -15,7 +15,7 @@ on:
 
 permissions: read-all
 
-timeout-minutes: 30
+timeout-minutes: 360
 
 network:
   allowed: