Bump agent to v-a718022
Bump agent to v-a718022

- Fix container CPU runtime metrics.
  See https://github.com/appsignal/probes-rs/pull/38 for more
  information.
- Improve host metrics calculations accuracy for counter metrics.
  See https://github.com/appsignal/probes-rs/pull/40 for more
  information.
- Support Kernel 4.18+ format of /proc/diskstats file parsing.
  See https://github.com/appsignal/probes-rs/pull/39 for more
  information.

appsignal/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal-ruby