Update interface used for Event Dispatcher

Problem/Motivation

The DispatcherInterface in https://git.drupalcode.org/project/social/-/blob/13.0.0-alpha23/modules/... uses CloudEvents\CloudEventInterface for the event object.

This is incorrect as this is more of a marker interface for the spec version. It should use the CloudEvents\V1\CloudEventInterface.

Steps to reproduce

Proposed resolution

Update the interface to CloudEvents\V1\CloudEventInterface.

This is a backward breaking change, although I expect it will not pose an actual problem. But this should land in the 13.x major.

Remaining tasks

User interface changes

API changes

Data model changes