This version mainly upgrade the spring boot version to 2.6.6 to fix some spring's security problem, and apply many enhancements from 2.X.

Details see following:

Enhancement

[#5344] Reset raft cluster ops for no leader by JRaft Api.
[#5884][#7810] Add the permission for history config.
[#7284] Enhance print exception details.
[#7799] Enhance console exception handler.
[#7802] Enhance thread pool manager.
[#7801] Enhance connection release timeout between server.
[#7803] Apply some Jraft Enhancement from 2.X.
[#7925] Client stops the UpdateTask after a service is unsubscribed.
[#8072] Reduce memory cost in DistroProtocol initialization to avoid OutOfMemoryError.
[#8144] Add volatile modifier to NamingProxy.serversFromEndpoint.
[#8203] Fix the concurrency problem about the iterator of ServerListManager.
[#8434] Enhance DistroConsistencyServiceImpl listen/unListen.

BugFix

[#6198][#7809] Fix StringUtils.join throw NullPointerException.
[#6273] Fix loop leave server.
[#7141][#7804] Fix the problem of the operator column being empty while configuring adding and deleting records.
[#7750][#7869] Fix bug in permissions management module, such as redundant 'nacos,' when change password.
[#7757][#7761] Fix jraft request parse failed problem.
[#7807] Fix yaml parse concurrent problem.
[#7836] Fix nacos-client can't parse localhost problem.
[#8012] Fix NPE in DistroConsistencyServiceImpl.Notifier.
[#8283] Fix thread safety problem when concurrently registering with the same cluster.
[#8428] Fix naming subscribe bug when multiple NamingService .
[#8539] Fix prometheus api error.

Dependency

[#7813] Upgrade log4j2 to 2.17.1.
[#7813] Upgrade logback to 1.2.9.
[#7813] Upgrade Jraft to 1.3.9.
[#8421] Remove commonOkHttp dependency.
[#8169] Upgrade spring-boot version to 2.6.6.