fix: Downgrade wicked pdf

[AyakorK]

🎩 Description

Please describe your pull request.
Downgrading wicked pdf to fix the issue of exporting surveys

📌 Related Issues

Link your PR to an issue

• [LYON] Downgrade Wicked_pdf signature

Testing

Describe the best way to test or validate your PR.

Example:

• Log in as admin
• Access Backoffice
• Go to a processes settings
• Enable a survey
• Fill and submit the survey
• Go back to the back office
• Exports the answers
• Check if it appears on the letter opener
• If it doesn't go to the sidekiq interface /sidekiq
• Login as system
• Make sure it is enqueued and not failed

Tasks

• Add specs
• Downgrade wicked_pdf

📷 Screenshots

Please add screenshots of the changes you're proposing if related to the UI