chore(changelog): Add PR #5070 to changelog

Author: markushi

CHANGELOG.md

@@ -24,6 +24,7 @@
 
 ### Internal
 
+- Track custom session replay masking usage via `ReplayCustomMasking` fake integration ([#5070](https://github.com/getsentry/sentry-java/pull/5070))
 - Establish new native exception mechanisms to differentiate events generated by `sentry-native` from `ApplicationExitInfo`. ([#5052](https://github.com/getsentry/sentry-java/pull/5052))
 - Set `write` permission for `statuses` in the changelog preview GHA workflow. ([#5053](https://github.com/getsentry/sentry-java/pull/5053))