security/xhash: Update to 3.6.3

Update to Go 1.24
Add vendor/modules.txt generated from 'go mod vendor'.
Add manpage.

Changelog:
Support algorithms in lowercase with -c option.
Prevent panic on invalid digest name.
Fix issue with algorithms in lowercase like those produced by
- FreeBSD's sha512t256
- NetBSD's blake2
- GNU coreutils's btsum

PR:		286191
Approved by:	submitter is maintainer