kvrocks: Flaky test on expire precision

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• I had searched in the issues and found no similar issues.

Version

https://github.com/apache/incubator-kvrocks/pull/981/commits/461d0e8cc95cf959df50db2d75fecffbfd919875

Minimal reproduce step

Flaky test on CI env.

What did you expect to see?

Tests passed.

What did you see instead?

--- FAIL: TestString (12.24s)
    --- FAIL: TestString/GETEX_EXAT_option (0.00s)
        assertions.go:36: 
            	Error Trace:	/home/runner/work/incubator-kvrocks/incubator-kvrocks/tests/gocase/unit/type/strings/assertions.go:36
            	            				/home/runner/work/incubator-kvrocks/incubator-kvrocks/tests/gocase/unit/type/strings/strings_test.go:155
            	Error:      	"11s" is not less than or equal to "10s"
            	Test:       	TestString/GETEX_EXAT_option
    --- FAIL: TestString/GETEX_PXAT_option (0.00s)
        assertions.go:36: 
            	Error Trace:	/home/runner/work/incubator-kvrocks/incubator-kvrocks/tests/gocase/unit/type/strings/assertions.go:36
            	            				/home/runner/work/incubator-kvrocks/incubator-kvrocks/tests/gocase/unit/type/strings/strings_test.go:162
            	Error:      	"11s" is not less than or equal to "10s"
            	Test:       	TestString/GETEX_PXAT_option

Anything Else?

cc @git-hulk please take a look.

Are you willing to submit a PR?

• I’m willing to submit a PR!