Update vrt.py

[Zprokkel]

updated the _JWT_SIGNING_KEY and the .js file where it came from

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Description of your pull request and other information

Fixes #

Template

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• 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

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• Fix or improvement to an extractor (Make sure to add/update tests)
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Copilot Summary

🤖 Generated by Copilot at efcaefc

Summary

🛠️🔑🎞️

Update VRT extractor to fix token generation and stream access. Update the key and URL used to sign the tokens from the main.js file.

_JWT_SIGNING_KEY
Updated for VRT player site
Winter streams flow on

Walkthrough

• Update the key and URL for generating tokens for VRT player (link)

[pukkandan]

Pls update tests

[bashonly]

Are you sure about this? The javascript URL changed, but the code hasn't changed:

    ui() {
        const t = atob("==QP3hjerIVMuJzKSRHUmlVZ0Rkd6hTSN92KzUEVmJnSDlWYmtWeaVVM1AnRw0CM".split("").reverse().join("")),
            i = atob("==AOzYWYjFmYzIDNyQTMmRTYwkjYxcjYiRGO4cjMiZ2Y2MTMwMWNhhDZjNWO0IzNwETNxcDN0I2Y1UDZwATNmVjY".split("").reverse().join("")),
            e = atob("==QN5UTYjVTZklzNyImN0ETZ0gzYzQjY3cDN5cTNxImY0ITYwAzN2E2YhNmNxcjMmJmZ2UWYxITN0ATN3gTOzIDZ".split("").reverse().join("")),
            s = atob("==QZhRjMhFDOhFzYlVDMiJzYkdTZhBDOmZTYjRzN4EjN2gzMmFGZ1IzN1EGZ2UDOiZWO2cDMwcjM4cDZxUjM5EmM".split("").reverse().join(""));
        return this.ri.indexOf("-dev") >= 0 ? {
            a: t,
            b: i
        } : this.ri.indexOf("-stag") >= 0 ? {
            a: t,
            b: e
        } : {
            a: t,
            b: s
        }
    }

which decodes to:

key id:                    0-0Fp51UZykfaiCJrfTE3+oMI8zvDteYfPtR+2n1R+z8w=
player-dev.vrt.be key:     b5f500d55cb44715107249ccd8a5c0136cfb2788dbb71b90a4f142423bacaf38
player-stag.vrt.be key:    d23987504521ae6fbf2716caca6700a24bb1579477b43c84e146b279de5ca595
player.vrt.be key:         2a9251d782700769fb856da5725daf38661874ca6f80ae7dc2b05ec1a81a24ae

[bashonly]

per #5671 (comment) this change fixes an http error 500 issue that started happening in the last couple weeks