Update phonopy requirement from <2.43.3,>=1.10.8 to >=2.43.6 (#1320)

* Update phonopy requirement from <2.43.3,>=1.10.8 to >=2.43.6

Updates the requirements on [phonopy](https://github.com/phonopy/phonopy) to permit the latest version.
- [Changelog](https://github.com/phonopy/phonopy/blob/develop/doc/changelog.md)
- [Commits](phonopy/phonopy@v1.10.8...v2.43.5)

---
updated-dependencies:
- dependency-name: phonopy
  dependency-version: 2.43.5
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* release phonopy upper pin

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: esoteric-ephemera <aaron.kaplan.physics@gmail.com>

Author: dependabot[bot]

pyproject.toml

@@ -44,7 +44,7 @@ aims = ["pymatgen-io-aims>=0.0.5", "pymatgen>=2025.10.7"]
 amset = ["amset>=0.4.15", "pydash"]
 cclib = ["cclib>=1.8.1"]
 mp = ["mp-api>=0.37.5"]
-phonons = ["phonopy>=1.10.8,<2.43.3", "seekpath>=2.0.0"] # issue writing CIFs because of bug in phonopy >=2.43.3
+phonons = ["phonopy>=2.43.6", "seekpath>=2.0.0"]
 lobster = ["ijson>=3.2.2", "lobsterpy>=0.4.0"]
 defects = [
     "dscribe>=1.2.0",