Bump @keycloak/keycloak-admin-client from 18.0.2 to 21.1.2

Bumps [@keycloak/keycloak-admin-client](https://github.com/keycloak/keycloak) from 18.0.2 to 21.1.2.
- [Release notes](https://github.com/keycloak/keycloak/releases)
- [Commits](keycloak/keycloak@18.0.2...21.1.2)

---
updated-dependencies:
- dependency-name: "@keycloak/keycloak-admin-client"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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