fix: replacing specific unicode characters with all unicode letters

[HackZers7]

What Changed

The closing-tag parsing regex was updated from:

^<\/[\w-:.\u00C0-\u00FF]+\s*>

to:

^<\/[\p{L}\w\-:.]+\s*>/u

The previous range \u00C0-\u00FF only covers a limited subset of Latin characters.
The new pattern uses \p{L} in Unicode mode (u), which properly supports letters from many writing systems and improves parsing for international tag names.

[chrisbottin]

Thanks @HackZers7 for your contribution.

Can you also add a test similar to https://github.com/chrisbottin/xml-parser/blob/master/test/index.ts#L383 to cover the support of additional unicode letters?

[HackZers7]

Added a test to check the parsing of various languages. An error that occurred for Oriental languages has also been fixed.

The test data is synthetic, generated using GPT.

[chrisbottin]

Thanks @HackZers7 for your contribution, the PR is merged and a new version 4.1.6 has been published.