Update CHANGELOG for release v3.8.3

Author: withchao

CHANGELOG/CHANGELOG-3.8.md

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+## [v3.8.3](https://github.com/openimsdk/open-im-server/releases/tag/v3.8.3) 	(2025-01-07)
+
+### New Features
+* feat: seq user and conversation seq synchronization: (#2924) (17d5df8)
+* feat: Change upload logs systemType to AppFramework.: (#2927) (120afdf)
+* feat: Optimize Scheduled Task: (#2985) (e989506)
+* feat: Optimizing RPC call: (#2993) (e3f609b)
+* feat: optimize error stack information: (#2995) (5503443)
+* feat: support message cache: (#3007) (8b79a76)
+* feat: optimize log output: (#3026) (a1b5f05)
+* feat: support GetLastMessage: (#3029) (ed0a834)
+* feat: change appNotificationAccount to appManagerAccount && fix: enable config center add env check && fix: error return: (#3038) (1e8a106)
+
+### Bug Fixes
+* fix: Wrong Redis Error Check: (#2891) (cf740a1)
+* fix: improve crontask delete outdated Data.: (#2901) (83ac4e8)
+* fix: go mod: (#2906) (de57e20)
+* fix: group member update face_url: (#2910) (1534575)
+* fix: update set seq implement.: (#2911) (1447732)
+* fix:Only print panic function frame && feat: log.ZPanic: (#2947) (92ea52f)
+* fix: server can return isEnd to control fetch messages when sdk pull …: (#2949) (42136c6)
+* fix: resolving v3.8.3 conflicts [#3018](https://github.com/openimsdk/open-im-server/pull/3018)
+* fix: rpc panic recover: (#2957) (b802437)
+* fix: modifying other fields while setting IsPrivateChat does not take effect: (#2972) (5a8f82d)
+* fix: when fetching a referenced message, it indicates that the original message has been deleted.: (#2977) (fdc97c6)
+* fix: when unable EnableHistoryForNewMembers, new group member can read last one message.: (#3001) (8702529)
+* fix: redis save error when KickTokens: (#3002) (66abd9e)
+* fix: The message @ information will be set only for members in the gr…: (#3009) (dec423e)
+* fix: online status error: (#3022) (435d8bb)
+* fix: resolving v3.8.3 conflicts [#3033](https://github.com/openimsdk/open-im-server/pull/3033)
+* fix: resolving v3.8.3 conflicts [#3044](https://github.com/openimsdk/open-im-server/pull/3044)
+* fix: GetUsersOnline returns an error in the online list: (#3040) (3f58f3e)
+
+### Chores
+* chore: update admin front image version: (#2893) (c353f55)
+
+### Others
+* deps: Merge  #2959 PRs into pre-release-v3.8.3 [#2960](https://github.com/openimsdk/open-im-server/pull/2960)
+* deps: Merge  #2958 PRs into pre-release-v3.8.3 [#2961](https://github.com/openimsdk/open-im-server/pull/2961)
+* Add a lead time for the token's issuance time.: (#2914) (7563aff)
+* docs: improve deployment docs in kubernetes.: (#2973) (4c53732)
+
+**Full Changelog**: [v3.8.2...v3.8.3](https://github.com/openimsdk/open-im-server/compare/v3.8.2...v3.8.3)
+

CHANGELOG/README.md

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