Bump @keycloak/keycloak-admin-client from 18.0.2 to 26.1.0

Bumps [@keycloak/keycloak-admin-client](https://github.com/keycloak/keycloak/tree/HEAD/js/libs/keycloak-admin-client) from 18.0.2 to 26.1.0.
- [Release notes](https://github.com/keycloak/keycloak/releases)
- [Commits](https://github.com/keycloak/keycloak/commits/26.1.0/js/libs/keycloak-admin-client)

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

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