presubmit: add a one hour timeout to bot_update.

Mirroring crrev.com/c/1717663. bot_update runs that take more than an
hour are typically hung in irrecoverable ways.

Recipe-Nontrivial-Roll: build
Change-Id: Ic0afc48db7e0ac3464888e7715621a04f55443ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1754263
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Haiyang Pan <hypan@google.com>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Auto-Submit: John Budorick <jbudorick@chromium.org>

recipes/recipe_modules/presubmit/api.py

@@ -52,7 +52,7 @@ class PresubmitApi(recipe_api.RecipeApi):
     """
     # Expect callers to have already set up their gclient configuration.
 
-    bot_update_step = self.m.bot_update.ensure_checkout()
+    bot_update_step = self.m.bot_update.ensure_checkout(timeout=3600)
     relative_root = self.m.gclient.get_gerrit_patch_root().rstrip('/')
 
     abs_root = self.m.context.cwd.join(relative_root)