util: change log level to debug calculating stale read ts

[cfzjywxk]

What problem does this PR solve?

Issue Number: ref #47308

Problem Summary:
Change log level to debug for

[2023/09/22 22:58:36.055 +00:00] [WARN] [builtin_time.go:6639] [calAppropriateTime] [minTime=2023/09/22 22:57:36.055 +00:00] [maxTime=2023/09/22 22:58:36.055 +00:00] [minSafeTime=2023/09/22 22:57:35.289 +00:00]

What is changed and how it works?

Check List

Tests

• Unit test

Side effects

Documentation

Release note

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ekexium, zyguan

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-27 02:18:52.265995279 +0000 UTC m=+414121.984337496: ☑️ agreed by ekexium.
• 2023-10-09 05:43:32.462770805 +0000 UTC m=+1031010.049880950: ☑️ agreed by zyguan.