Update Changes

Author: lestrrat

Changes

@@ -4,7 +4,8 @@ Changes
 v2 has many incompatibilities with v1. To see the full list of differences between
 v1 and v2, please read the Changes-v2.md file (https://github.com/lestrrat-go/jwx/blob/develop/v2/Changes-v2.md)
 
-v2.0.21 UNRELEASED
+v2.0.21 07 Mar 2024
+[Security]
   * [jwe] Added `jwe.Settings(jwe.WithMaxDecompressBufferSize(int64))` to specify the
     maximum size of a decompressed JWE payload. The default value is 10MB. If you
     are compressing payloads greater than this and want to decompress it during