Bump markupsafe from 2.1.5 to 3.0.1 in /backend/src

Bumps [markupsafe](https://github.com/pallets/markupsafe) from 2.1.5 to 3.0.1.
- [Release notes](https://github.com/pallets/markupsafe/releases)
- [Changelog](https://github.com/pallets/markupsafe/blob/main/CHANGES.rst)
- [Commits](pallets/markupsafe@2.1.5...3.0.1)

---
updated-dependencies:
- dependency-name: markupsafe
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/src/requirements.txt

@@ -3,6 +3,6 @@ click==8.1.7
 Flask==3.0.3
 itsdangerous==2.2.0
 Jinja2==3.1.4
-MarkupSafe==2.1.5
+MarkupSafe==3.0.1
 Werkzeug==3.0.4
 gunicorn==23.0.0