Bump keycloak-js from 25.0.6 to 26.0.6 in /client

Bumps [keycloak-js](https://github.com/keycloak/keycloak) from 25.0.6 to 26.0.6.
- [Release notes](https://github.com/keycloak/keycloak/releases)
- [Commits](keycloak/keycloak@25.0.6...26.0.6)

---
updated-dependencies:
- dependency-name: keycloak-js
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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