KB10036164 | CCMSETUP.exe verison not changed

Because ccmsetup.exe didn't change, therefore, there's no reason to increment its version number.

Agree with Jason, the changes and new features in ConfigMgr version 2103 does't include updating ccmsetup.exe.

For more details, we could view the following articles:
This article summarizes the changes and new features in Configuration Manager, version 2103:
https://video2.skills-academy.com/en-us/mem/configmgr/core/plan-design/changes/whats-new-in-version-2103
And this one mainly describes issues that are fixed in Configuration Manager, version 2103:
https://video2.skills-academy.com/en-us/mem/configmgr/hotfix/2103/10036164

Hope the information can help you.

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But when i check in Monitoring > Client status > Production client status. I see my clients are getting updated to new version.

How it is getting updated ?

ccmsetup.exe and the client agent itself are two different things and their versions in no way need to be the same or reflect changes in one another.