Symfony 5 support (drop > 4.4)

[rick-lam]

Summary

Moves the library to Symfony 5 only on PHP 7.4, and migrates the test suite to PHPUnit 8 (bumped on master in #32).

• symfony/process & symfony/event-dispatcher: ^2.8 | ^3.2 | ^4.0 → ^5 (Symfony 4.4 support dropped).
• php: → ^7.4; Composer platform.php pinned to 7.4.
• Event-dispatcher modernised for Symfony 5 (removed Symfony\Component\EventDispatcher\Event, swapped dispatch() argument order):
  • RunEvent / PriorityChangedEvent extend Symfony\Contracts\EventDispatcher\Event.
  • EventDispatcherTrait dispatches as dispatch($event, $name).
• PHPUnit 8 migration (required — phpunit 8 fatals on an untyped setUp()):
  • setUp(): void across the unit tests.
  • assertInternalType('float', …) → assertIsFloat(…).
• symfony/console (dev): ^4 | ^5. graze/console-diff-renderer has no Symfony 5 release yet, so it still resolves to console 4.x for the Table/Lines tests — this is a dev/optional dependency and does not affect the library's Symfony 5 runtime support.
• composer.lock regenerated for the new constraints.

Verification

PHP 7.4 + Symfony 5.4 (process 5.4.51 / event-dispatcher 5.4.45) + PHPUnit 8.5.52:

• 131 tests pass (phpunit exit 0; remaining output is deprecation warnings only — assertArraySubset / @expectedException, both removed in PHPUnit 9, left as a follow-up).
• phpcs clean.
• composer update reports no security advisories.

GitHub Actions CI is added separately in #34 (Travis → GHA); once that lands it validates this matrix on every PR.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates graze/parallel-process to support Symfony 5 (while retaining Symfony 4.4 compatibility) by modernizing event-dispatcher usage and tightening Composer platform requirements to a Symfony-5-compatible PHP baseline.

Changes:

• Update event classes/tests to extend/use Symfony\Contracts\EventDispatcher\Event (Symfony 5 compatible).
• Update EventDispatcherTrait to use the Symfony 5+ dispatch($event, $name) argument order.
• Update Composer constraints for PHP and Symfony components (symfony/process, symfony/event-dispatcher) and pin the dev resolution platform to PHP 7.4.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/unit/Event/EventDispatcherTest.php	Switch test Event base class import to Symfony Contracts.
tests/src/EventDispatcherFake.php	Switch fake dispatcher Event base class import to Symfony Contracts.
src/Event/RunEvent.php	Switch event base class to Symfony\Contracts\EventDispatcher\Event.
src/Event/PriorityChangedEvent.php	Switch event base class to Symfony\Contracts\EventDispatcher\Event.
src/Event/EventDispatcherTrait.php	Update dispatch call signature to Symfony 5+ ordering and update Event import.
composer.json	Raise PHP requirement, update Symfony package constraints, and set Composer platform PHP to 7.4.

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