main/tizen-mkdzimage: fix source repository URL

Shinjo Parkrequested to merge
peremen/pmaports:fix-tizen-mkdzimage into master

Since https://git.tizen.org is not reachable for a logn amount of time, switch the upstream URL to postmarketOS GitLab instead.

Fixes issue #3752 (closed).

[ci:skip-build]: already built successfully in CI

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