fix: Update CHANGELOG to remove miscellaneous section

Removed miscellaneous section and release note for version 0.10.3 from CHANGELOG.

Author: SoulPancake

CHANGELOG.md

@@ -8,10 +8,6 @@
 * add token expiry buffer to prevent expired token usage and lock concurrent refreshes ([#283](https://github.com/openfga/python-sdk/issues/283)) ([3b31489](https://github.com/openfga/python-sdk/commit/3b31489b946358ed07c05757edc001c023d94748))
 
 
-### Miscellaneous
-
-* release 0.10.3 ([db01f91](https://github.com/openfga/python-sdk/commit/db01f916214d528aed3e0724e2a8233e10ab6ea7))
-
 ## [0.10.2](https://github.com/openfga/python-sdk/compare/v0.10.1...v0.10.2) (2026-04-21)