Update CHANGELOG for release v3.8.3-patch.3

CHANGELOG/CHANGELOG-3.8.md

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+## [v3.8.3-patch.3](https://github.com/openimsdk/open-im-server/releases/tag/v3.8.3-patch.3) 	(2025-03-07)
+
+### New Features
+* feat: optimizing BatchGetIncrementalGroupMember #3180
+
+### Bug Fixes
+* fix: solve uncorrect notification when set group info #3172
+* fix: the sorting is wrong after canceling the administrator in group settings #3185
+* fix: solve uncorrect GroupMember enter group notification type. #3188
+
+### Refactors
+* refactor: change sendNotification to sendMessage to avoid ambiguity regarding message sending behavior. #3173
+
+**Full Changelog**: [v3.8.3-patch.2...v3.8.3-patch.3](https://github.com/openimsdk/open-im-server/compare/v3.8.3-patch.2...v3.8.3-patch.3)
+

CHANGELOG/README.md

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+# CHANGELOGs
+
+- [CHANGELOG-3.8.md](./CHANGELOG-3.8.md)
+