⬆️ frontend: Bump react-intl from 5.24.0 to 6.5.5 in /frontend

Bumps [react-intl](https://github.com/formatjs/formatjs) from 5.24.0 to 6.5.5.
- [Release notes](https://github.com/formatjs/formatjs/releases)
- [Commits](https://github.com/formatjs/formatjs/compare/react-intl@5.24.0...react-intl@6.5.5)

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

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