build(deps): bump marshmallow in the pip group across 1 directory

Bumps the pip group with 1 update in the / directory: [marshmallow](https://github.com/marshmallow-code/marshmallow).


Updates `marshmallow` from 3.21.2 to 3.26.2
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@3.21.2...3.26.2)

---
updated-dependencies:
- dependency-name: marshmallow
  dependency-version: 3.26.2
  dependency-type: indirect
  dependency-group: pip
...

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

Author: dependabot[bot]