meta: Update CHANGELOG for 6.19.4

- unblocks React 18 across our SDKs
- updates NextJS SDK to add React 18 peer dep

Author: AbhiPrasad

CHANGELOG.md

@@ -4,6 +4,13 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
+## 6.19.4
+
+- feat(react): Add React 18 as peer dep (#4819)
+- ref(build): Add `build/types` to tarballs and adjust `types` entry points (#4824)
+
+Work in this release contributed by @Turbo87. Thank you for your contribution!
+
 ## 6.19.3
 
 - feat(browser): Add new v7 Fetch Transport ([#4765](https://github.com/getsentry/sentry-javascript/pull/4765))