Bump marshmallow from 4.0.0 to 4.1.2 (#275)

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 4.0.0 to 4.1.2.
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@4.0.0...4.1.2)

---
updated-dependencies:
- dependency-name: marshmallow
  dependency-version: 4.1.2
  dependency-type: indirect
...

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Author: dependabot[bot]