build(deps): bump tough-cookie, sqlite3 and jest in /backend

Removes [tough-cookie](https://github.com/salesforce/tough-cookie). It's no longer used after updating ancestor dependencies [tough-cookie](https://github.com/salesforce/tough-cookie), [sqlite3](https://github.com/TryGhost/node-sqlite3) and [jest](https://github.com/facebook/jest/tree/HEAD/packages/jest). These dependencies need to be updated together.


Removes `tough-cookie`

Updates `sqlite3` from 4.1.1 to 4.2.0
- [Release notes](https://github.com/TryGhost/node-sqlite3/releases)
- [Changelog](https://github.com/TryGhost/node-sqlite3/blob/v4.2.0/CHANGELOG.md)
- [Commits](TryGhost/node-sqlite3@v4.1.1...v4.2.0)

Updates `jest` from 25.4.0 to 29.6.1
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/jestjs/jest/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/commits/v29.6.1/packages/jest)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
- dependency-name: sqlite3
  dependency-type: direct:production
- dependency-name: jest
  dependency-type: direct:development
...

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