Fix generateBid()'s broser signal's recency unit to milliseconds

SHA: 24af79a
Reason: push, by qingxinwu

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

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-   <p id="w3c-state"><a href="https://www.w3.org/standards/types/#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-12-27">27 December 2024</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types/#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2025-01-09">9 January 2025</time></p>
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