Bump marshmallow from 3.18.0 to 3.26.2

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 3.18.0 to 3.26.2.
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/3.26.2/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@3.18.0...3.26.2)

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

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

Author: dependabot[bot]

requirements.prod.txt

@@ -32,7 +32,7 @@ django-sans-db==1.2.0
     # via -r requirements.prod.in
 docutils==0.21.2
     # via sphinx
-environs==14.1.1
+environs[django]==14.1.1
     # via -r requirements.prod.in
 gunicorn==23.0.0
     # via -r requirements.prod.in
@@ -46,7 +46,7 @@ markupsafe==3.0.2
     # via
     #   jinja2
     #   werkzeug
-marshmallow==3.18.0
+marshmallow==3.26.2
     # via environs
 packaging==25.0
     # via