community/dzonegit: upgrade to 0.15

https://github.com/oskar456/dzonegit/releases/tag/v0.15

v0.14...v0.15

a96597de Migrate to GitHub Actions (#18)
498d4a8b setup the correct pre-state for test_get_zone_name
2f7776c0 Reverting the latest commit to avoid state pollution
35d01a79 Apply whitespace check only on *.zone files.
d809e241 Fixup tests for whitespace error handling
17cbd099 Version 0.15