Bump marshmallow from 3.23.1 to 3.26.2

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 3.23.1 to 3.26.2.
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/3.26.2/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@3.23.1...3.26.2)

---
updated-dependencies:
- dependency-name: marshmallow
  dependency-version: 3.26.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -17,7 +17,7 @@ pg8000==1.31.5
 
 # API and Models
 Flask-RESTful==0.3.10
-marshmallow==3.23.1
+marshmallow==3.26.2
 marshmallow-sqlalchemy==1.1.0
 flask-marshmallow==1.2.1
 flask-apispec==0.11.4