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

openttd: update to 13.1.
https://github.com/void-linux/void-packages/pull/44212

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

#### Local build testing
- I built this PR locally for my native architecture, amd64-glibc
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - amd64-musl