Pydanticv2again - Githubissues

iterating on #412 -- I was going to PR to that, but this PR grew, so better to collect comments here.

Description

[x] Apply Levi's pydantic v1/v2 tolerant import approach. qcng is still using v1 API closes #412
[x] Update GHA versions for checkout and codecov and switch GHA from conda to mamba for speedier solves and more comprehensive can't-solves
[x] Update QCEngineRecords to a commit that also has Levi's pydantic v1/v2 tolerant approach. Add an excuse for QChem molecules for None != {} resulting from https://github.com/MolSSI/QCElemental/pull/305
[x] Pin black to year 2022, since that's before the great blank line removing kerfluffle, which apparently can't be compromised on until 2024.
[x] I saw a case where it was sometimes "Driver gradient not implemented" and sometimes "Driver DriverEnum.gradient not implemented", so pass either since it's just a check.
[x] Fixed a couple Sphinx complaints, so it'll build again. Note that Sphinx is restrained to pydantic=1 for autodoc-pydantic package's sake.
[x] Tweaked some environment spec files. Note that any with psi4 could use an overhaul b/c moved to c-f. But qcel, qcng, and psi4 are so co-dependent, we need to get pydantic straightened out first.
[x] Edit versioneer according to plan in https://github.com/MolSSI/QCElemental/issues/313 so that it hopefully works with Python 3.12