feat: update to zig-0.14

[stefanboca]

Update to Zig 0.14.

Most changes involve straightforward renames of standard library types.

The only nontrivial change is regarding pop. Based on my understanding:

• In 0.13, calling pop() on an empty collection would panic.
• In 0.14, popOrNull() has been renamed to pop(), which now returns an optional value. Using pop().? will also panic if the value is null.

Therefore, migrating from pop() in 0.13 to pop().? in 0.14 should preserve the original behavior. However, I'm not very knowledgable about Zig so I recommend verifying this to ensure accuracy.

[nolanderc]

Thanks! I was looking to do this myself some day, but you beat me to it 🙂