Bump marshmallow from 2.20.4 to 2.20.5
Bump marshmallow from 2.20.4 to 2.20.5

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 2.20.4 to 2.20.5.
- [Release notes](https://github.com/marshmallow-code/marshmallow/releases)
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst)
- [Commits](https://github.com/marshmallow-code/marshmallow/compare/2.20.4...2.20.5)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
svenstaro/python-web-boilerplate,svenstaro/python-web-boilerplate