Update CHANGELOG.md (#2348)

* Update CHANGELOG.md

* Update CHANGELOG.md

Co-authored-by: jennyf19 <[email protected]>

---------

Co-authored-by: jennyf19 <[email protected]>

Author: westin-m

CHANGELOG.md

@@ -1,5 +1,11 @@
 See the [releases](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases) for details on bug fixes and added features.
 
+6.33.0
+=======
+## Bug Fixes:
+- Clean up log messages. See [#2339](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/2339) for details.
+
+- Decouple JsonElements from JsonDocument, which causes issues in multi-threaded environments. See [#2340](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/2340) for details.
 6.32.3
 =======
 ## Bug fixes: