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

grml-zsh-config: update to 0.19.4.
https://github.com/void-linux/void-packages/pull/39911

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

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With the last version (0.19.1), there is a grep warning on every startup: `grep: warning: stray \ before 0`