www/webhook: Update to 2.8.2

• Pet portclippy/portfmt.
• Remove old patches.
• Replace PORTVERSION with DISTVERSION.

ChangeLogs:

• https://github.com/adnanh/webhook/releases/tag/2.8.1
• https://github.com/adnanh/webhook/releases/tag/2.8.2

PR: 287611
Approved by: maintainer timeout (2 weeks)
Approved by: acm (mentor)