Bump marshmallow from 3.21.2 to 3.21.3 in /src/publishers

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 3.21.2 to 3.21.3.
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@3.21.2...3.21.3)

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

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

src/publishers/requirements.txt

@@ -4,7 +4,7 @@ Flask-Cors==4.0.1
 Flask-RESTful==0.3.10
 gevent==24.2.1
 gunicorn==22.0.0
-marshmallow==3.21.2
+marshmallow==3.21.3
 marshmallow-enum==1.5.1
 oauth2client==4.1.3
 paramiko==3.4.0