[DIFE-1733] Decidim upgrade

DIFE-1733

Change log

• Added:
• Changed:
  • Decidim repository hash
  • Application autoload engine to Zeitwerk
  • Removed Warnings caused by upgrade
• Deprecated:
• Removed:
• Fixed:
• Security:

Commands

[Insert commands here]

Notes

[Insert here notes about the PR, how to test it, problems found and how they were solved, etc.]