Update request: ALVR 20.6.1 → 20.9.1

[Titaniumtown]

• Package name: ALVR
• Latest released version: 20.9.1
• Current version on the unstable channel: 20.6.1
• Current version on the stable/release channel: 20.6.1
• [X] Checked the nixpkgs pull requests

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@PassiveLemon

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[NyCodeGHG]

relevant: #308097