chore(main): release 2.19.4 (#2719)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Brent Shaffer <betterbrent@google.com>

Author: release-please[bot]

CHANGELOG.md

@@ -1,5 +1,7 @@
 # Changelog
 
+## 2.19.4
+
 ## 2.19.3
 
 ## 2.19.2