chore(deps): update quay.io/keycloak/keycloak docker tag to v21

This MR contains the following updates:

Package	Update	Change
quay.io/keycloak/keycloak	major	20.0.5 -> 21.0.1

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charts/keycloak/Chart.yaml

@@ -9,4 +9,4 @@ sources:
   - https://github.com/keycloak/keycloak
 version: 0.5.4
 # renovate: image=quay.io/keycloak/keycloak
-appVersion: "20.0.5"
+appVersion: "21.0.1"