Security: Update bundled Root Certificates.

🎵 60,000 certs on the wall. 60,000 certs. Take one down, pass it around, 59,999 certs on the wall. 🎵

The Root Certificate bundle maintained by Mozilla ships in WordPress to allow SSL certificates to be verified on hosts with incomplete, outdated, or invalid local SSL configurations.

This updates the `ca-bundle.crt` file to the latest version, which applies upstream changes from the bundle maintained by Mozilla and keeps all unexpired legacy 1024bit certificates which are kept for backward compatibility purposes (see [35919]).

This equals `alot` of certificates.

Partially merges [59740] and [59969] to the 6.0 branch.

Props johnbillion, desrosj, whyisjake, ayeshrajans, SergeyBiryukov, swissspidy, skithund, barry, joedolson.
Fixes #60000. See #62811, #62711.

git-svn-id: https://develop.svn.wordpress.org/branches/6.0@60000 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj