Update jboss/keycloak Docker tag to v15.0.2

This MR contains the following updates:

Package	Type	Update	Change
jboss/keycloak	ironbank-docker	patch	15.0.0 -> 15.0.2
jboss/keycloak		patch	15.0.0 -> 15.0.2
jboss/keycloak	stage	patch	15.0.0 -> 15.0.2

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