Bump marshmallow from 3.20.2 to 3.21.0

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 3.20.2 to 3.21.0.
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@3.20.2...3.21.0)

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

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

requirements.txt

@@ -12,7 +12,7 @@ lark==1.1.9
     # via -r requirements.in
 lxml==5.1.0
     # via -r requirements.in
-marshmallow==3.20.2
+marshmallow==3.21.0
     # via -r requirements.in
 more-itertools==10.2.0
     # via -r requirements.in