[6.0] Fix warning in OSSignpost.swift
w/ @preconcurrency import
#7786
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Cherry-pick of #7785.
Explanation: Fixes a Swift Concurrency warning for an import of a preconcurrency module.
Scope: Isolated to a warning in a single file.
Risk: Very low, change is NFC.
Testing: Manually verified that the warning is gone.
Issue: rdar://131432130
Reviewer: @xedin