chore: Zig master compatibility for main library

[adoerr]

Fix std.ArrayList field initialization for Reader and Writer .

With this PR deprecated default values for std.ArrayList have been removed.

We are affected by this, because the (also deprecated) std.ArrayListUnmanaged is an aliased std.ArrayList. I haven't changed std.ArrayListUnamagned to std.ArrayList in order to keep changes for this PR minimal.

[Copilot]

Pull request overview

This PR standardizes initialization of internal container fields in the XML Reader and Writer to use the explicit .empty initializer, improving clarity around “empty but valid” container state at construction.

Changes:

• Update Writer.init to initialize strings, element_names, and ns_prefixes with .empty.
• Update Reader.init to initialize spans, attributes, strings, element_names, and ns_prefixes with .empty.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Writer.zig	Uses .empty for empty container initialization in Writer.init.
src/Reader.zig	Uses .empty for empty container initialization in Reader.init.

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[ianprime0509]

Sorry, just noticed this PR now, and after resolving conflicts, it looks like #65 took care of this. Thank you, though!