Auth Changelog for M54 (#3570)

Author: paulb777

Firebase/Auth/CHANGELOG.md

@@ -1,3 +1,8 @@
+# v6.2.3
+- [fixed] Make sure the first valid auth domain is retrieved. (#3493)
+- [fixed] Add assertion for Facebook generic IDP flow. (#3208)
+- [fixed] Build for Catalyst. (#3549)
+
 # v6.2.2
 - [fixed] Fixed an issue where unlinking an email auth provider raised an incorrect error stating the account was not linked to an email auth provider. (#3405)
 - [changed] Renamed internal Keychain classes. (#3473)