Bump cypress from 13.17.0 to 15.7.0 in /flowauth/frontend

Bumps [cypress](https://github.com/cypress-io/cypress) from 13.17.0 to 15.7.0.
- [Release notes](https://github.com/cypress-io/cypress/releases)
- [Changelog](https://github.com/cypress-io/cypress/blob/develop/CHANGELOG.md)
- [Commits](cypress-io/cypress@v13.17.0...v15.7.0)

---
updated-dependencies:
- dependency-name: cypress
  dependency-version: 15.7.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]