[update] security/gobuster version 3.4.0

Hi,

an update for security/gobuster to version 3.4.0 :
https://github.com/OJ/gobuster

- update Makefile for version 3.4.0 + fix comment (remove the leading
article)
- remove unnecessary PKGNAME in Makefile
- generate and use modules.inc for Go modules

Build and tests OK on amd64.

Please review and commit if OK.

Laurent