Update root certificate to CAcert.

Lib/test/https_svn_python_org_root.pem

 -----BEGIN CERTIFICATE-----
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-KqMiDP+JJn1fIytH1xUdqWqeUQ0qUZ6B+dQ7XnASfxAynB67nfhmqA==
------END CERTIFICATE-----
\ No newline at end of file
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+-----END CERTIFICATE-----