Update CHANGELOG for release v3.8.3-patch.6

CHANGELOG/CHANGELOG-3.8.md

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+## [v3.8.3-patch.6](https://github.com/openimsdk/open-im-server/releases/tag/v3.8.3-patch.6) 	(2025-07-23)
+
+### Bug Fixes
+* fix: Add friend DB in notification sender [#3438](https://github.com/openimsdk/open-im-server/pull/3438)
+* fix: remove update version file workflows have new line in 3.8.3-patch branch. [#3452](https://github.com/openimsdk/open-im-server/pull/3452)
+* fix: s3 aws init [#3454](https://github.com/openimsdk/open-im-server/pull/3454)
+* fix: use safe submodule init in workflows in v3.8.3-patch. [#3469](https://github.com/openimsdk/open-im-server/pull/3469)
+
+**Full Changelog**: [v3.8.3-patch.5...v3.8.3-patch.6](https://github.com/openimsdk/open-im-server/compare/v3.8.3-patch.5...v3.8.3-patch.6)
+

CHANGELOG/README.md

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