[gerrit_client] Uprev vpython python to 3.11

Tested by running `vpython3 gerrit_client.py` so at least everything
loads with 3.11

Change-Id: I925fce1ce3fd4c427a57fb590c991bf49b99c1be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5741852
Reviewed-by: Yiwei Zhang <yiwzhang@google.com>
Commit-Queue: Allen Li <ayatane@chromium.org>

recipes/recipe_modules/gitiles/resources/gerrit_client.py.vpython3

@@ -1,4 +1,4 @@
-python_version: "3.8"
+python_version: "3.11"
 
 wheel: <
   name: "infra/python/wheels/httplib2-py3"