AsyncApi generator duplicate events when regenerate the catalog with different event version

### I tried this:

Starting with an AsyncAPI file that defines an event called myEvent and includes the following metadata: `x-eventcatalog-message-version: "1"`

When I update the message version to: `x-eventcatalog-message-version: "2"`

I notice that the service.md file shows a duplicated dispatched message:
```
sends:
- id: myEvent
version: '1'
- id: myEvent
version: '2'
```

### This happened:

The old message version (which no longer exists in the AsyncAPI file) is still present in the service.md file, causing a duplication of the dispatched event.

### I expected this:

I expected the AsyncAPI file to be the source of truth, meaning the service.md should only include event versions that are currently defined in the AsyncAPI file.

### Is there a workaround?

_No response_

### Anything else?

_No response_

### EventCatalog Version

_No response_

### Node.js Version

_No response_

### Platform(s)

_No response_

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