Clarify export target option error (keycloak#51011)

Closes keycloak#50700

Signed-off-by: Akash Kumar <meakash7902@gmail.com>

Set version to 26.7.0

Set version to 26.6.4

Set version to 26.6.3

Set version to 26.6.2

Set version to 26.4.12

Set version to 26.2.16

Set version to 26.6.1

Set version to 26.6.0