Use a longer key in mitmproxy-ca.pem.

tests/keys/mitmproxy-ca.pem

@@ -1,32 +1,50 @@
------BEGIN RSA PRIVATE KEY-----
-MIICWwIBAAKBgQDKLbznLxS7HSWvrmGcvVS6eQvjEWD705/csvnk/WtqAPfQMJKt
-auFBxzPt6RT60SHtj/2FKt2gqsiE6cNINxGN6fGYD7HtaM5HXRVPUKJaMipJwHha
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-Rl2Va3UtErPKJeMg2dTH18PuXykQMsQR1+rPxf1WSA==
------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----
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+HzPh2taMnCA0h1fNLFFBkw88
+-----END PRIVATE KEY-----
 -----BEGIN CERTIFICATE-----
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-CW1pdG1wcm94eTESMBAGA1UEChMJbWl0bXByb3h5MB4XDTEzMDkyNjE0MzYxMVoX
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-n95u
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 -----END CERTIFICATE-----