CHROMIUM: switch to python 3.11 from 3.8

Zephyr starts using features not present in 3.8 (CL:5779572),
so switch to the newer version of Python.

BUG=b:320527549
TEST=zmake build -a
TEST=./twister

Change-Id: I2b70b2906c890bda943026bf5cf0926034bce5b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5783822
Tested-by: Dawid Niedźwiecki <dawidn@google.com>
Reviewed-by: Fabio Baltieri <fabiobaltieri@google.com>
Commit-Queue: Dawid Niedźwiecki <dawidn@google.com>

.vpython3

@@ -5,7 +5,7 @@
 # This is the list of all the required packages for zephyr tools.
 # It doesn't include everything in scripts/requirements.txt only
 # the packages that have been discovered as actually being necessary.
-python_version: "3.8"
+python_version: "3.11"
 
 wheel: <
   name: "infra/python/wheels/anytree-py2_py3"
@@ -45,7 +45,7 @@ wheel: <
 >
 wheel: <
   name: "infra/python/wheels/ruamel_yaml_clib/${vpython_platform}"
-  version: "version:0.2.6"
+  version: "version:0.2.8"
 >
 wheel: <
   name: "infra/python/wheels/ruamel_yaml-py3"