chore: set propert type in noSwap

[imaliouris]

Description

htmx 4's docs show htmx.config.noSwap = [204, 304, '4xx', '5xx'] as the way to restore htmx 2.x error-swapping behavior (see the migration guide and "What's New in htmx 4"). In a TypeScript project this assignment produces a type error, because the shipped type definitions don't match htmx 4's config.

This PR updates the type definitions so that:

• htmx.config.noSwap is typed as (number | string)[], so status codes and wildcard patterns like '4xx' and '5xx' are accepted

Example that previously failed to type-check and now compiles:

htmx.config.noSwap = [204, 304, '4xx', '5xx'];

Testing

• Ran tsc --noEmit against a small TypeScript file containing the snippet above. It errored before this change and passes after.
• Checked that numeric-only values such as htmx.config.noSwap = [204, 304] still type-check.

Checklist

• I have read the contribution guidelines
• I have targeted this PR against the correct branch (master for website changes, dev for
  source changes)
• This is either a bugfix, a documentation update, or a new feature that has been explicitly
  approved via an issue
• I ran the test suite locally (npm run test) and verified that it succeeded