fix thread pool error

[wangqianqianjun]

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When the thread pool is dynamically expanded, and current thread pool maximum size < dynamicCoreSize , will throw exception and stop the current process.
So first need expand maximum size , then expand core size.

[ThinkingMan007]

好的，我已收到。

[wangqianqianjun]

For jdk 1.8 that no problem, but when you upgrade your jdk to 16 , will cause some problems.

[ThinkingMan007]

好的，我已收到。