fix(deps): update dependency keycloak-js to v21

This MR contains the following updates:

Package	Type	Update	Change
keycloak-js (source)	dependencies	major	^20.0.1 -> ^21.0.0

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Release Notes

keycloak/keycloak

v21.0.0

Compare Source

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This MR has been generated by Renovate Bot.

added renovate label

mentioned in issue #60

added 3 commits

• 1d61b5c3...34db34a4 - 2 commits from branch main
• ae46fbfa - fix(deps): update dependency keycloak-js to v21

Compare with previous version

changed the description

mentioned in commit 3ca49fa6

merged