chore(python): Add kokoro configs for python 3.10 samples testing (#1556)

diff --git a/samples/compute/noxfile.py b/samples/compute/noxfile.py
index 1fd8956..93a9122 100644
--- a/samples/compute/noxfile.py
+++ b/samples/compute/noxfile.py
@@ -87,7 +87,7 @@
 
 # DO NOT EDIT - automatically generated.
 # All versions used to test samples.
-ALL_VERSIONS = ["3.6", "3.7", "3.8", "3.9"]
+ALL_VERSIONS = ["3.6", "3.7", "3.8", "3.9", "3.10"]
 
 # Any default versions that should be ignored.
 IGNORED_VERSIONS = TEST_CONFIG["ignored_versions"]