build: pace has no py-3.13 support due to pySHiELD

[romanc]

Description

pace depends on pySHiELD. pySHiELD depends on a homegrown version of pyrte-rrtmgp. That pyrte-rrtmgp only supports python versions 3.11 and 3.12. Since NDSL only supports 3.12 and 3.13, we end up with pace only supporting 3.12.

The good news here is that the official version of pyrte-rrtmgp supports python versions 3.13 and 3.14. Once the "upstream" changes are merged into the "NOAA version" of pyrte-rrtmgp, we can support 3.13 and possibly 3.14 in both pySHiELD and pace.

How Has This Been Tested?

Trying a local install with 3.14 in the context of NOAA-GFDL/NDSL#554.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas: N/A
• I have made corresponding changes to the documentation: N/A
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules: N/A
• New check tests, if applicable, are included: N/A

[romanc]

With NOAA-GFDL/pySHiELD#111 in the merge queue, lets push the button here too. That way we keep pace and pySHiELD in sync.