Update ctsm_pylib to 3.13.2

[samsrabin]

Description of changes

This PR changes conda_env_ctsm_py.txt to install Python 3.13.2 instead of Python 3.7.9.

Remaining work:

• Update black in GitHub workflow to match this environment
• Get pylint passing
• Freeze all versions in the ctsm_pylib text file
• Try installing on a Mac
• git mv conda_env_ctsm_pylib_3_13_2.txt conda_env_ctsm_py.txt
• Add (and test!) --upgrade option to py_env_create, to replace existing ctsm_pylib
• Add ctsm_pylib documentation

Specific notes

Contributors other than yourself, if any: None

CTSM Issues Fixed::

• Resolves Move ctsm_pylib to something beyond 3.7 #2625
• Will resolve Add User's Guide section about ctsm_pylib #2771

Are answers expected to change (and if so in what way)? No

Any User Interface Changes (namelist or namelist defaults changes)? No

Does this create a need to change or add documentation? Did you do so? Pre-existing need for documentation (see #2771); not yet

Testing performed, if any:

• Python unit tests
• Python system tests
• Black check
• Pylint check
• ctsm_pymods test suite