api: zbus: Make zbus a stable API

Make zbus stable API since it fulfills all the requirements that
makes an API stable.

Signed-off-by: Rodrigo Peixoto <rodrigopex@gmail.com>

Author: rodrigopex

include/zephyr/zbus/zbus.h

@@ -18,6 +18,8 @@ extern "C" {
 /**
  * @brief Zbus API
  * @defgroup zbus_apis Zbus APIs
+ * @since 3.3.0
+ * @version 1.0.0
  * @ingroup os_services
  * @{
  */