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] <[email protected]>

requirements.txt

@@ -2,7 +2,7 @@
 
 aiomcache==0.8.1
 aiohttp==3.9.3
-marshmallow==3.20.2
+marshmallow==3.21.0
 msgpack==1.0.7
 pytest==7.4.4
 pytest-asyncio==0.23.5