Update emmet-core requirement from <0.57 to <0.64

Updates the requirements on [emmet-core](https://github.com/materialsproject/emmet) to permit the latest version.
- [Release notes](https://github.com/materialsproject/emmet/releases)
- [Changelog](https://github.com/materialsproject/emmet/blob/main/docs/CHANGELOG.md)
- [Commits](materialsproject/emmet@v0.1-alpha...v0.63.1)

---
updated-dependencies:
- dependency-name: emmet-core
  dependency-type: direct:production
...

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

requirements.txt

@@ -5,4 +5,4 @@ pymatgen==2023.1.30
 matminer==0.8.0
 numpy>=1.20
 scikit-learn==1.2.0
-emmet-core<0.57  # Can remove after https://github.com/materialsproject/api/issues/819
+emmet-core<0.64  # Can remove after https://github.com/materialsproject/api/issues/819