Reduce test wall time (Round 2 Electric Boogaloo) (#403)

Author: CompRhys

.github/workflows/test.yml

@@ -62,10 +62,8 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-14]
         version:
-          - { python: '3.12', resolution: highest }
           - { python: '3.12', resolution: lowest-direct }
           - { python: '3.13', resolution: highest }
-          - { python: '3.13', resolution: lowest-direct }
         model:
           - { name: fairchem, test_path: "tests/models/test_fairchem.py" }
           - { name: fairchem-legacy, test_path: "tests/models/test_fairchem_legacy.py" }