Bump newrelic_rpm from 6.3.0.355 to 6.4.0.356
Bump newrelic_rpm from 6.3.0.355 to 6.4.0.356

Bumps [newrelic_rpm](https://github.com/newrelic/rpm) from 6.3.0.355 to 6.4.0.356.
- [Release notes](https://github.com/newrelic/rpm/releases)
- [Changelog](https://github.com/newrelic/rpm/blob/master/CHANGELOG.md)
- [Commits](https://github.com/newrelic/rpm/compare/6.3.0.355...6.4.0.356)
nickaknudson/southwest-checkin,nickaknudson/southwest-checkin,nickaknudson/southwest-checkin