Update CHANGELOG for release v3.8.3-patch.2

CHANGELOG/CHANGELOG-3.8.md

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+## [v3.8.3-patch.2](https://github.com/openimsdk/open-im-server/releases/tag/v3.8.3-patch.2) 	(2025-02-28)
+
+### Bug Fixes
+* fix: Offline push does not have a badge && Android offline push (#3146) [#3174](https://github.com/openimsdk/open-im-server/pull/3174)
+
+**Full Changelog**: [v3.8.3-patch.1...v3.8.3-patch.2](https://github.com/openimsdk/open-im-server/compare/v3.8.3-patch.1...v3.8.3-patch.2)
+

CHANGELOG/README.md

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