Bump newrelic_rpm from 5.5.0.348 to 5.6.0.349

Bumps [newrelic_rpm](https://github.com/newrelic/rpm) from 5.5.0.348 to 5.6.0.349.
- [Release notes](https://github.com/newrelic/rpm/releases)
- [Changelog](https://github.com/newrelic/rpm/blob/master/CHANGELOG.md)
- [Commits](https://github.com/newrelic/rpm/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -310,7 +310,7 @@ GEM
     multi_xml (0.6.0)
     multipart-post (2.0.0)
     nenv (0.3.0)
-    newrelic_rpm (5.5.0.348)
+    newrelic_rpm (5.6.0.349)
     nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     notiffany (0.1.1)