Looks like they just renewed it 5 hours ago. [1]

    Valid from  Mon, 11 Sep 2023 13:28:21 UTC
    Valid until Sun, 10 Dec 2023 13:28:20 UTC (expires in 2 months and 28 days)

    # date
    Mon Sep 11 18:26:30 UTC 2023

[1] - https://www.ssllabs.com/ssltest/analyze.html?d=pecl.php.net

The certificate is no longer valid. If you need to download packages, you'll have to wait.

Bye bye CI builds (at least for now).