[3.6] bpo-36816: Update the self-signed.pythontest.net cert (GH-13192) (GH-13198)

We updated the server, our testsuite must match.

https://bugs.python.org/issue36816

✈️ CLE -> DEN ✈️ GH-pycon2019
(cherry picked from commit 6bd81734)
Co-authored-by: Gregory P. Smith <greg@krypto.org>

Lib/test/selfsigned_pythontestdotnet.pem

 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

Misc/NEWS.d/next/Tests/2019-05-08-15-55-46.bpo-36816.WBKRGZ.rst

+Update Lib/test/selfsigned_pythontestdotnet.pem to match self-signed.pythontest.net's new TLS certificate.
\ No newline at end of file