Bump itsdangerous from 2.1.2 to 2.2.0 in /backend/src

Bumps [itsdangerous](https://github.com/pallets/itsdangerous) from 2.1.2 to 2.2.0.
- [Release notes](https://github.com/pallets/itsdangerous/releases)
- [Changelog](https://github.com/pallets/itsdangerous/blob/main/CHANGES.rst)
- [Commits](pallets/itsdangerous@2.1.2...2.2.0)

---
updated-dependencies:
- dependency-name: itsdangerous
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/src/requirements.txt

@@ -1,7 +1,7 @@
 blinker==1.7.0
 click==8.1.7
 Flask==3.0.3
-itsdangerous==2.1.2
+itsdangerous==2.2.0
 Jinja2==3.1.3
 MarkupSafe==2.1.5
 Werkzeug==3.0.2