Revert pmg update (#1020)

- [ ] I have read the [Developer
Guide](https://quantum-accelerators.github.io/quacc/dev/contributing.html).
Don't lie! 😉
- [ ] My PR is on a custom branch and is _not_ named `main`.
- [ ] I have added relevant unit tests. Note: Your PR will likely not be
merged without proper tests.

pyproject.toml

@@ -35,7 +35,7 @@ dependencies = [
  "numpy>=1.25.0",
  "pydantic>=2.0.1",
  "pydantic-settings>=2.0.3",
- "pymatgen>=2023.10.3",
+ "pymatgen>=2023.9.10",
  "typer>=0.9.0",
 ]