Bump monty from 2021.5.9 to 2021.6.10

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)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -2,7 +2,7 @@ numpy==1.20.3
 scipy==1.6.3
 FireWorks==1.9.7
 pymatgen-analysis-diffusion==2021.4.29
-monty==2021.5.9
+monty==2021.6.10
 paramiko==2.7.2
 tqdm==4.61.0
 pybtex==0.24.0