Update marshmallow requirement from ~=3.18.0 to ~=3.19.0

Updates the requirements on [marshmallow](https://github.com/marshmallow-code/marshmallow) to permit the latest version.
- [Release notes](https://github.com/marshmallow-code/marshmallow/releases)
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@3.18.0...3.19.0)

---
updated-dependencies:
- dependency-name: marshmallow
  dependency-type: direct:production
...

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

requirements.txt

@@ -1,6 +1,6 @@
 python-dateutil~=2.8.2
 OutCache==1.0.1
-marshmallow~=3.18.0
+marshmallow~=3.19.0
 dataclasses-json~=0.5.7
 aiohttp~=3.8.3
 Faker==13.15.0