agging changelog

Author: sfc-gh-mkeller

DESCRIPTION.md

@@ -17,6 +17,7 @@ Source code is also available at: https://github.com/snowflakedb/snowflake-conne
   - Added support for base64-encoded DER private key strings in the `private_key` authentication type.
   - Added support for OAuth authorization code flow.
   - Added support for PKCE on top of OAuth authorization flow.
+  - Added support for refresh token on top of OAuth authorization flow.
 
 - v3.12.4(December 3,2024)
   - Fixed a bug where multipart uploads to Azure would be missing their MD5 hashes.