Switch to using Composer\InstalledVersions for AboutCommand

[lrljoe]

Switch to using Composer\InstalledVersions for AboutCommand to reduce necessity to update ServiceProvider with a new version for each release.

This also makes it easier for identifying which branch is in use when undertaking development

All Submissions:

• [X] Have you followed the guidelines in our Contributing document?
• [X] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. [X] Does your submission pass tests and did you add any new tests needed for your feature?
2. [X] Did you update all templates (if applicable)?
3. [X] Did you add the relevant documentation (if applicable)?
4. [X] Did you test locally to make sure your feature works as intended?

Changes to Core Features:

• [X] Have you added an explanation of what your changes do and why you'd like us to include them?
• [X] Have you written new tests for your core changes, as applicable?
• [X] Have you successfully ran tests with your changes locally?