update PCMSolver interface to v1.2.3

[loriab]

Description

For reasons described at PCMSolver/pcmsolver#201, Psi4 has been fixed at PCMSolver v1.2.1 . This updates to v1.2.x with very small (e.g., 1e-8) tweaks to ref values. I do finally understand why v1.3.x was failing, but those are much larger changes to ref values (e.g., 1e-2; probably washes out in relative energies), so I'd like @robertodr to weigh in.

UPDATE: The plan is to go with v1.2 for now and wait on v1.3. The conda package is RTG at 1.2 but isn't merged yet. A later rebuild of the 1.8 conda package could include pcmsolver support.

User API & Changelog headlines

• Update PCMSolver to v1.2.3 or v1.3.x

Dev notes & details

• add pcmsolver citation printing to psi4 output file
• build c-f package Add PCMSolver conda-forge/staged-recipes#22286
• update ecosys GHA to test pcmsolver
• this runs fine locally, and I'm confident in it, so marking ready for review. it'll take a while for CI to catch up to that optimism.

Checklist

• Tests added for any new features
• All or relevant fraction of full tests run

Status

• Ready for review
• Ready for merge

[JonathonMisiewicz]

Rubber stamp.

[markperri]

The latest version of psi4 is giving errors when using pcmsolver: PCMSolver/pcmsolver#206