build(deps): bump com.mixpanel.android:mixpanel-android

Bumps [com.mixpanel.android:mixpanel-android](https://github.com/mixpanel/mixpanel-android) from 8.3.0 to 8.4.0.
- [Release notes](https://github.com/mixpanel/mixpanel-android/releases)
- [Changelog](https://github.com/mixpanel/mixpanel-android/blob/master/CHANGELOG.md)
- [Commits](mixpanel/mixpanel-android@v8.3.0...v8.4.0)

---
updated-dependencies:
- dependency-name: com.mixpanel.android:mixpanel-android
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -71,7 +71,7 @@ espresso = "3.7.0"
 mockk = "1.13.16"
 turbine = "1.2.0"
 robolectric = "4.14.1"
-mixpanel = "8.3.0"
+mixpanel = "8.4.0"
 
 timber = "5.0.1"
 voyager = "1.1.0-beta03"