upgrade default nox python version

Author: abbrowne126

noxfile.py

@@ -34,7 +34,7 @@
 
 MYPY_VERSION = "mypy==1.10.0"
 
-DEFAULT_PYTHON_VERSION = "3.8"
+DEFAULT_PYTHON_VERSION = "3.13"
 
 UNIT_TEST_PYTHON_VERSIONS: List[str] = [
     "3.7",
@@ -351,7 +351,7 @@ def cover(session):
     session.run("coverage", "erase")
 
 
-@nox.session(python="3.10")
+@nox.session(python="3.13")
 def docs(session):
     """Build the docs for this library."""