Update test SSL certificate and key to 3072 bit (fixes: #217)

On Debian/unstable the test suite fails due to the SSL key which is only
1024 bits long. We again borrow the CPython test suites certificates
which were recently updated to 3072 bits.

tests/certs/ssl_cert.pem

@@ -1,15 +1,34 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

tests/certs/ssl_key.pem

@@ -1,16 +1,40 @@
 -----BEGIN PRIVATE KEY-----
-MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBANtb0+YrKuxevGpm
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 -----END PRIVATE KEY-----