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

thunderbird: fix update-check
https://github.com/void-linux/void-packages/pull/50659

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

Before that change, `./xbps-src update-check thunderbird` returned `125.0` as version. Apart from that the previously used mozilla site just redirected to thunderbird.net anyways.

cc @dataCobra