refactor: remove obsolete // +build tag

[huyejia]

Fixes | Closes | Resolves #

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Changes:

From Go 1.17, the preferred syntax for build constraints is //go:build,
which replaces the old // +build form. The old style is now considered
deprecated but still supported for backward compatibility.

This change removes the obsolete // +build xxx line, keeping only the
modern //go:build xxx directive.

More info: golang/go#41184 and https://go.dev/doc/go1.17#build-lines

Design Doc / Proposal：
https://go.dev/design/draft-gobuild

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Testing

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[huyejia]

@stdevMac @AntiD2ta Hi, Could you please review this PR at your convenience? Thank you very much.