diskcache.TrimCheckIntervalSec successd seem to not take effect.

[caoxianfei1]

Describe the bug (描述bug)
client.yaml:

diskCache.fullRatio: 90
diskCache.safeRatio: 70
diskCache.trimRatio: 50
diskCache.maxUsableSpaceBytes: 10737418240
diskCache.maxFileNums: 1000000
diskCache.trimCheckIntervalSec： 50000

First, write a file so that the capacity of the cache disk is equal to 6.9G that 7G should be in the full state. Then adjust the diskTrimCheckIntervalSec to 5s, and then observe the change in the usage capacity of the cache disk. It seems that there is no decrease and is still 6.9G.

To Reproduce (复现方法)

Expected behavior (期望行为)

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