changelog: Point the entry at the actual PR number

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: romtsn

CHANGELOG.md

@@ -9,7 +9,7 @@
 ### Fixes
 
 - Release `MediaMuxer` when the replay video encoder fails to start to avoid a resource leak ([#5607](https://github.com/getsentry/sentry-java/pull/5607))
-- Prevent an ANR when the Session Replay video encoder gets stuck ([#5841](https://github.com/getsentry/sentry-java/pull/5841))
+- Prevent an ANR when the Session Replay video encoder gets stuck ([#5842](https://github.com/getsentry/sentry-java/pull/5842))
   - Some hardware encoders never signal end-of-stream, which made the replay worker spin forever while holding the encoder lock. The app's lifecycle callbacks then blocked on that lock and the app froze until the system killed it. The encoder now gives up instead of spinning, and closing the replay cache no longer waits indefinitely for a wedged encoder.
 
 ### Performance