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

thunderbird: update to 115.0
https://github.com/void-linux/void-packages/pull/43607

Description:
[ci skip]

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

#### 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):
 - [x] x86_64
 - [x] armv7l (crossbuild)
 - [x] aarch64 (crossbuild)
 - [x] i686 (native)
 - [x] x86_64-musl (native)
 - [ ] ~~armv6l-musl~~ (not supported)
 - [x] aarch64-musl
 
 
 #### Notes
 - Fixed `MOZILLA_SITE`
 - The UI seems a bit buggy with switching to calendars