Bump maggma from 0.29.0 to 0.30.2

Bumps [maggma](https://github.com/materialsproject/maggma) from 0.29.0 to 0.30.2.
- [Release notes](https://github.com/materialsproject/maggma/releases)
- [Changelog](https://github.com/materialsproject/maggma/blob/main/docs/CHANGELOG.md)
- [Commits](materialsproject/maggma@v0.29.0...v0.30.2)

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

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

requirements-ci.txt

@@ -8,4 +8,4 @@ flake8==3.9.2
 pylint==2.9.6
 black==21.7b0
 treon==0.1.3
-maggma==0.29.0
+maggma==0.30.2