There's a closed pull request on the void-packages repository

New package: mullvad-vpn-2021.6
https://github.com/void-linux/void-packages/pull/34720

Description:
Since this packages precompiled binaries (for Debian), maybe the package name should be renamed to something like `mullvad-vpn-bin`. I am not sure what the procedure is, please let me know.

#### Testing the changes
- I tested the changes in this PR: **YES**

#### New package
- This new package conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements): **YES**

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#### Local build testing
- I built this PR locally for my native architecture, (x86_64-glibc)

Resolves https://github.com/void-linux/void-packages/issues/21154.