chore(genai): update confi to limit tests to just python 3.12

Author: msampathkumar

genai/code_execution/noxfile_config.py

@@ -22,7 +22,7 @@
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    "ignored_versions": ["2.7", "3.7", "3.8", "3.10", "3.11", "3.12"],
+    "ignored_versions": ["2.7", "3.7", "3.8", "3.9", "3.10", "3.11", "3.13", "3.14"],
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them
     "enforce_type_hints": True,