Testing all_major_minor_python_versions helper uses python 2.7 & 3.6-3.9, needs update

[huonw]

Describe the bug

The Pants-internal all_major_minor_python_versions helper currently includes Python versions 2.7, 3.6-3.9, with a comment about updating this as new versions are supported.

pants/src/python/pants/testutil/python_interpreter_selection.py

Lines 131 to 134 in 6f8e16e

	versions = InterpreterConstraints(constraints).partition_into_major_minor_versions(
	# Please update this when new stable Python versions are released to CI.
	interpreter_universe=["2.7", "3.6", "3.7", "3.8", "3.9"]
	)

We support new Python versions, and have them in CI machines, since that code was added in #12656. For instance, #21568 makes it explicit that we install 3.7-3.13 on CI machines.

Presumably we should reconsider which Python's we attempt to test against.

Pants version

latest main

OS
N/A

Additional info
N/A