jsr223: add busEvent to the ScriptAction preset

Depends on openhab/openhab-core#5064

Author: dilyanpalauzov

configuration/jsr223.md

@@ -401,6 +401,7 @@ This preset can be useful for scheduling asynchronous code execution with `org.o
 | Variable          | Description                                                        |
 |-------------------|--------------------------------------------------------------------|
 | `scriptExecution` | `org.openhab.core.automation.module.script.action.ScriptExecution` |
+| `busEvent`        | `org.openhab.core.automation.module.script.action.BusEvent`        |
 
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