Update panic handler

Zig master changed how default panic handlers are called, this is a tracking update which makes ZTAP compatible with that change.

Master-branch compatible release

This is v0.8.1, modified to build with the latest release of zig master, which have lowercased the names used in Type.

This project will switch to tracking 0.14 when released, in the meantime, if you're using recent builds, this is the release you want.

ZTAG v0.8.1

Unlikely to change in any essential or API way.