chore(deps): update xpkg.upbound.io/crossplane-contrib/provider-keycloak docker tag to v1.6.0

This MR contains the following updates:

Package	Type	Update	Change
xpkg.upbound.io/crossplane-contrib/provider-keycloak		minor	v1.5.0 -> v1.6.0
xpkg.upbound.io/crossplane-contrib/provider-keycloak	ironbank-docker	minor	v1.5.0 -> v1.6.0
xpkg.upbound.io/crossplane-contrib/provider-keycloak	stage	minor	v1.5.0 -> v1.6.0

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