Feature Request: Support for Mautic 6 (Symfony 6) & PHP 8.3

[peterle19840]

Mautic Version

4.2.x series

PHP version

Mautic 6

What browsers are you seeing the problem on?

No response

What happened?

Hello everyone,

I am currently setting up a fresh Mautic 6 environment using Docker and would like to use the Custom Objects plugin.

However, installation via Composer fails due to dependency conflicts, as the current versions seem to be locked to Mautic 5 (mautic/core-lib ^5.0) and older PHP versions.

My Environment:

• Mautic Version: 6.0.6
• PHP Version: 8.3.27
• Installation Method: Docker / Composer

Steps to reproduce:
I tried to install the plugin via:
composer require acquia/mc-cs-plugin-custom-objects

The Output/Error:

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires acquia/mc-cs-plugin-custom-objects * -> satisfiable by acquia/mc-cs-plugin-custom-objects[dev-epic-golden_template, ..., dev-beta, 1.0.0, 5.x-dev, 9999999-dev].
    - acquia/mc-cs-plugin-custom-objects[dev-epic-golden_template, ..., dev-beta, 1.0.0] require mautic/core-lib ^4.3 -> found mautic/core-lib[4.3.0-beta, ..., 4.x-dev] but it conflicts with your root composer.json require (6.0.6).
    - acquia/mc-cs-plugin-custom-objects 5.x-dev requires mautic/core-lib ^5.0 -> found mautic/core-lib[5.0.0-alpha, ..., 5.x-dev] but it conflicts with your root composer.json require (6.0.6).
    - acquia/mc-cs-plugin-custom-objects[dev-sonar, dev-deployed] require php ^7.1 || ^7.2 -> your php version (8.3.27) does not satisfy that requirement.

### How can we reproduce this issue?

Step 1: 

### Relevant log output

```shell

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