Update changelog

Author: antonis

CHANGELOG.md

@@ -12,6 +12,7 @@
 
 - Vendor `metro/countLines` function to avoid issues with the private import ([#5185](https://github.com/getsentry/sentry-react-native/pull/5185))
 - Fix baseJSBundle and bundleToString TypeErrors with Metro 0.83.2 ([#5206](https://github.com/getsentry/sentry-react-native/pull/5206))
+- Fixes .env file loading in Expo sourcemap uploads ([#5210](https://github.com/getsentry/sentry-react-native/pull/5210))
 
 ### Dependencies