Bump emmet-core from 0.83.6 to 0.84.2

Bumps [emmet-core](https://github.com/materialsproject/emmet) from 0.83.6 to 0.84.2.
- [Release notes](https://github.com/materialsproject/emmet/releases)
- [Changelog](https://github.com/materialsproject/emmet/blob/main/docs/CHANGELOG.md)
- [Commits](materialsproject/emmet@v0.83.6...v0.84.2)

---
updated-dependencies:
- dependency-name: emmet-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,5 +1,5 @@
 pymatgen==2024.8.9
-emmet-core==0.83.6
+emmet-core==0.84.2
 pydantic==2.4.2
 pydantic-core==2.10.1
 pydantic-settings==2.2.1