Bump monty from 2021.5.9 to 2021.6.10 (#293)

Bumps [monty](https://github.com/materialsvirtuallab/monty) from 2021.5.9 to 2021.6.10.
- [Release notes](https://github.com/materialsvirtuallab/monty/releases)
- [Changelog](https://github.com/materialsvirtuallab/monty/blob/master/docs/changelog.html)
- [Commits](materialsvirtuallab/monty@v2021.5.9...v2021.6.10)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -3,5 +3,5 @@ pymatgen==2022.0.8
 typing-extensions==3.10.0.0
 maggma==0.29.0
 requests==2.25.1
-monty==2021.5.9
+monty==2021.6.10
 emmet-core==0.2.2