updated default python version

Author: daniel-sanche

owlbot.py

@@ -29,6 +29,7 @@
 templated_files = common.py_library(
     unit_test_python_versions=["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"],
     system_test_python_versions=["3.9", "3.14"],
+    default_python_version="3.11",
     cov_level=99,
     intersphinx_dependencies={
         "pandas": "https://pandas.pydata.org/pandas-docs/stable/"
@@ -40,4 +41,4 @@
 # Run blacken session
 # ----------------------------------------------------------------------------
 
-s.shell.run(["nox", "-s", "blacken"], hide_output=False)
+s.shell.run(["nox", "-s", "format"], hide_output=False)