Changed 'latest' job in test and docs workflows to use Python 3.12

[swryan]

Summary

Changed 'latest' job in test and docs workflows to use Python 3.12

Pinned Python 3.12 for the latest build in the test workflow.
Python 3.13 needs NumPy >=2.1 and we still have issues with pyoptsparse using NumPy 2.

Added a python313 job to the test workflow, which uses Python 3.13 and NumPy 2 but excludes pyoptsparse.

Also:

• updated the doc build workflow to use the latest openmdao release for the docs that are published
• updated the balanced_field_funccomp example to a handle recent change in the ExplicitFuncComp API
• updated cannonball examples to use OpenMDAO's InterpND instead of SciPy interp1d
• updated/refactored balanced field examples

Related Issues

• Resolves #

Backwards incompatibilities

None

New Dependencies

None

[robfalck]

Option use_jax in ExplicitFuncCompneeds to be changed to optionderivs_method='jax'`.

I've added a backwards incompatibility to that PR.

Mention of use_jax in the OpenMDAO documentation needs to be removed.

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[coveralls]

coverage: 93.685% (-0.2%) from 93.903%
when pulling efc3c34 on swryan:latest
into 19249bd on OpenMDAO:master.