databases/prometheus-postgres-exporter: update to 0.17.1

new upstream release; this adds support for PostgreSQL 17.

changes in 0.17.0: https://github.com/prometheus-community/postgres_exporter/releases/tag/v0.17.0
changes in 0.17.1: https://github.com/prometheus-community/postgres_exporter/releases/tag/v0.17.1

while here, update my email address.

PR: 285064
Reviewed by: arrowd, imp
Approved by: arrowd (ports), kevans (mentor)
Pull Request: https://github.com/freebsd/freebsd-ports/pull/379