fix: allow future versions of the event-dispatcher

[geerteltink]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://www.conventionalcommits.org/
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• fix: Bugfix
• feat: Feature
• revert: Revert previous commit
• style: Code style update (formatting, local variables)
• refactor: Refactoring (no functional changes, no api changes)
• ci: CI related changes
• build: Build related changes
• docs: Documentation content changes
• perf: A code change that improves performance
• test: Adding missing tests or correcting existing tests

What is the current behavior?

The symfony event-dispatcher is locked to version 4.4.

Issue Number: N/A

What is the new behavior?

Allow event-dispatcher ^4.4.

Does this PR introduce a breaking change?

• Yes
• No

Other information