fix for deprecated Symfony Event class

[seth-shaw-asu]

GitHub Issue: #927

What does this Pull Request do?

Updates deprecated Symfony Event class with the new Drupal one and updates the argument order for the dispatch function as specified in https://www.drupal.org/node/3159012.

What's new?

• Does this change add any new dependencies? No, although it now uses the JWT module's 1.1 release.
• Does this change require any other modifications to be made to the repository
  (i.e. Regeneration activity, etc.)? No.
• Could this change impact execution of existing code? No.

How should this be tested?

Short version

Smoke test. Does anything break?

Longer version

1. composer require webprofiler
2. drush en -y webprofiler
3. drush cr = 💥
4. Apply PR
5. drush cr = 👍 (unless you have other modules enabled with the same problem)

Documentation Status

• Does this change existing behaviour that's currently documented? No.
• Does this change require new pages or sections of documentation? No.
• Who does this need to be documented for? No one.

Interested parties

@Islandora/committers

[jordandukart]

Works as described, messages to go out to ActiveMQ and things are generated. Don't see a blow up with webprofiler either.