net/spoofdpi: Update 1.2.1 => 1.4.0

Changelogs:

• https://github.com/xvzc/spoofdpi/releases/tag/v1.3.0
• https://github.com/xvzc/spoofdpi/releases/tag/v1.3.1
• https://github.com/xvzc/spoofdpi/releases/tag/v1.4.0

Port changes:

• Require at least Go 1.26.
• Update WWW entries.
• Remove sample configuration.
• Update rc.d service to disable default TUI.

Reviewed by: osa, vvd (mentors)
Approved by: osa, vvd (mentors)
Differential Revision: https://reviews.freebsd.org/D56737