Upgrade Typescript to move configuration from const to let

[MichaelWest22]

Description

Upgrade of Typescript version to 5.5.4 to allow creation of d.ts file with let instead of const which seems to be the case with version 5.1 and above and this hopefully will allow typescript users to modify config items that were blocked from re-assignment with const.

tested with all recent releases of typescript and 5.5.4 have new type generation rules that seem to respect the jsdoc type annotations better. see Node Reuse in Declaration Emit in https://devblogs.microsoft.com/typescript/announcing-typescript-5-5/

Also removed the duplicated src/htmx.d.ts file that is no longer used for the distribution? need to verify we no longer need to keep maintaining this file manually.

Resolved one type check for HttpVerb detected by updated typescript.

Corresponding issue:
#2850

Testing

Ran test suite and but I have not tested the generated d.ts file in a typescript project to confirm it resolves the original problem

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