Bump newrelic from 6.2.0.156 to 6.4.3.160

Bumps [newrelic](https://github.com/newrelic/newrelic-python-agent) from 6.2.0.156 to 6.4.3.160.
- [Release notes](https://github.com/newrelic/newrelic-python-agent/releases)
- [Commits](newrelic/newrelic-python-agent@v6.2.0.156...v6.4.3.160)

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