net/ngrep: Update 1.45 => 1.48.3, reset maintainer

Changelog:
https://github.com/jpr5/ngrep/blob/v1.48.3/README.md#whats-new

PR: 291115
Approved by: logan@elandsys.com (maintainer, timeout - inactive for 10+ years)
Co-authored-by: Nithurshen Karthikeyan <nithurshen@gmail.com>