chore(changelog): Merge duplicate Dependencies subsections under Unreleased (#5815)

The Unreleased section contained two separate "### Dependencies"
subsections, one added by #5793 and one by #5779. Merge them into a
single subsection, keeping both entries.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: runningcode

CHANGELOG.md

@@ -16,9 +16,6 @@
 - Bump Native SDK from v0.15.3 to v0.15.4 ([#5793](https://github.com/getsentry/sentry-java/pull/5793))
   - [changelog](https://github.com/getsentry/sentry-native/blob/master/CHANGELOG.md#0154)
   - [diff](https://github.com/getsentry/sentry-native/compare/0.15.3...0.15.4)
-
-### Dependencies
-
 - The SDK is now compiled with Android Gradle Plugin 9.2.1 ([#5779](https://github.com/getsentry/sentry-java/pull/5779))
 
 ## 8.49.0