Upgrade to Symfony 7.3 & PHP 8.4

[njoubert-cleverage]

Description

• Set symfony require to 7.3.* on composer.json
• Update docker configuration with PHP 8.4
• Update rector configuration with minimal version PHP 8.1
• Update github workflows with PHP 8.1 to 8.4 and Symfony ^6.4|^7.3

Requirements

• Documentation updates
  • Reference
  • Changelog
• Unit tests

Breaking changes

• Remove support for Symfony < 7.3 due to EOL