CLI-1679: Revert PHP 8.5 forks.

[jigar-shah-acquia]

Motivation
Fixes #CLI-1679

Proposed changes

• Revert the use of custom forks and dev branches introduced for PHP 8.5 compatibility.

Update composer.json to use the latest stable upstream releases for:

• amplitude-php (>= 1.0.9)

• amphp/parallel (>= 2.3.3)

• revolt/event-loop (>= 1.0.8)
  Remove references to custom repositories and branch aliases.

• Ensure Acquia CLI continues to function correctly on PHP 8.5 using officially supported dependencies.

Alternatives considered
N/A

Testing steps

1. Follow the contribution guide to set up your development environment or download a pre-built acli.phar for this PR.
2. If running from source, clear the kernel cache to pick up new and changed commands: ./bin/acli ckc
3. Check for regressions: (add specific steps for this pr)
4. Check new functionality: (add specific steps for this pr)

[Copilot]

Pull request overview

This PR aims to revert the use of custom forks and development branches that were previously introduced for PHP 8.5 compatibility. The changes update the zumba/amplitude-php package constraint from ^1.0.4 to ^1.0.9 to use the latest stable upstream release instead of a custom fork.

Key changes:

• Update zumba/amplitude-php version constraint from ^1.0.4 to ^1.0.9

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