Bump marshmallow from 3.24.1 to 3.26.2 in /requirements

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 3.24.1 to 3.26.2.
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/3.26.2/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@3.24.1...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/install.txt

@@ -81,7 +81,7 @@ markupsafe==3.0.2
     #   jinja2
     #   mako
     #   werkzeug
-marshmallow==3.24.1
+marshmallow==3.26.2
     # via
     #   apispec
     #   bemserver-api (pyproject.toml)