[arte] Allow downloading age restricted content

[StefanLobbenmeier]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

I thought that arte.tv looks at the cookies to determine if the logged in user has confirmed their age. But to my surprise, the cookies are not sent in the request, instead there is a header called x-validated-age that is set by the client. When I set that client in yt-dlp we can also access age restricted content.

Template

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
• Searched the bugtracker for similar pull requests
• Checked the code with flake8 and ran relevant tests

In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under Unlicense. Check all of the following options that apply:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Fix or improvement to an extractor (Make sure to add/update tests)
• New extractor (Piracy websites will not be accepted)
• Core bug fix/improvement
• New feature (It is strongly recommended to open an issue first)

Copilot Summary

🤖 Generated by Copilot at 93c400c

Summary

🎥🔞🌐

Add X-Arte-User-Profile header to arte.py extractor to access age-restricted videos. This fixes the extraction of some Arte videos that are blocked by age verification.

config header set
Bypassing age check for Arte
Winter of content

Walkthrough

• Bypass age verification for some Arte videos by adding a header to the config JSON request (link)

[StefanLobbenmeier]

Related issue: #7782

[StefanLobbenmeier]

Request in browser: