net-mgmt/ping_exporter: Update to 1.1.4

MFH the latest version from main to fix the port, which was broken in
main at the time 2025Q3 was branched.

Upstream release notes:
https://github.com/czerwonk/ping_exporter/releases/tag/1.1.4

(cherry picked from commit d5fd36ca84360fea5c17fcc9e3c34796aa7ed806)

net-mgmt/ping-exporter: update to 1.1.3

Take maintainership (maintainer timeout).

While here, stop hardcoding the commit id in ${GO_MODULE}.

(cherry picked from commit 8db8d7828f8e382561de80e6bb35b47228359ccb)

PR: 289619
Reviewed by: jrm
Approved by: jrm (ports)
Differential Revision: https://reviews.freebsd.org/D52553