build: bump marshmallow from 2.19.2 to 2.19.3 (#1542)
build: bump marshmallow from 2.19.2 to 2.19.3 (#1542)

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 2.19.2 to 2.19.3.
- [Release notes](https://github.com/marshmallow-code/marshmallow/releases)
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/2.19.3/CHANGELOG.rst)
- [Commits](https://github.com/marshmallow-code/marshmallow/compare/2.19.2...2.19.3)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
skylines-project/skylines,skylines-project/skylines,skylines-project/skylines,skylines-project/skylines