Update quay.io/keycloak/keycloak Docker tag to v26.0.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
quay.io/keycloak/keycloak	final	patch	26.0.5 -> 26.0.6
quay.io/keycloak/keycloak		patch	26.0.5 -> 26.0.6

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