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

thunderbird(-i18n): update to 115.9.0 and adopt both packages.
https://github.com/void-linux/void-packages/pull/49396

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

#### Local build testing
- I built this PR locally for my native architecture, (x86_64-glibc)
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - x86_64-musl
  - i686

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