Create new-relic-ios-6084.mdx

[NPunit]

https://source.datanerd.us/mobile-apps/rpm_ios/releases/tag/6.8.4

https://newrelic.slack.com/archives/C0MPP9KD2/p1733312778082909

Create release notes for app update 6.8.4

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

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