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

common/travis/fetch_upstream.sh: fix CI for new git version
https://github.com/void-linux/void-packages/pull/36725

Description:
The newest git versions require [safe.directory](https://git-scm.com/docs/git-config/2.35.2#Documentation/git-config.txt-safedirectory) to work properly for repos owned by others.

#### Testing the changes
- I tested the changes in this PR: **YES**
  Tested by temporarily adding a commit that changed a package to this PR, and [it succeeded](https://github.com/void-linux/void-packages/actions/runs/2177619018).
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