sysutils/jail_exporter: 0.18.0

The main change is to update many dependencies, including some with
known security vulnerabilities.

https://github.com/phyber/jail_exporter/blob/main/CHANGELOG.md

PR: 289926
Sponsored by: ConnectWise
Approved by: David O'Rourke <dor.bsd@xm0.uk> (maintainer)