(Using XAMPP version 7.0.9 on Windows 10.) After 50 minutes of searching and trying things, it was a single line fix:

Edit C:\xampp\php\php.ini and add the line:

curl.cainfo = "C:/xampp/apache/bin/curl-ca-bundle.crt"

Oddly I didn't even have to update curl-ca-bundle.crt to a new version. Just needed that setting set.

Edit: AND restart Apache! :smiley:

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