Update to version 0.15.2
This is primarily motivated to support compiling the ghostty tip branch locally on Tumbleweed. The package was recently removed because of the zig version incompatibility but their main branch does support the newest version of zig. However, they recently started pinning to specific patch versions so 0.15.2 is needed for that.
I had some notes about this package:
* How is the vendor.tar.zst generated for the zig language? I looked at the wiki (https://en.opensuse.org/Zig#Packaging) but that is written for zig packages and I couldn't find an appropriate build command to generate something similar to the vendor tarball in this repo (the cached dependencies were drastically different)
* The changelog I added is sparse because apparently the zig developers don't publish release notes for bugfix releases.
OBS-URL: https://build.opensuse.org/request/show/1325648
OBS-URL: https://build.opensuse.org/package/show/devel:languages:zig/zig0.15?expand=0&rev=6
