OTA examples: Updated server certificate

examples/system/ota/advanced_https_ota/server_certs/ca_cert.pem

@@ -1,21 +1,20 @@
 -----BEGIN CERTIFICATE-----
-MIIDXTCCAkWgAwIBAgIJAP4LF7E72HakMA0GCSqGSIb3DQEBCwUAMEUxCzAJBgNV
-BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
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-hA==
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 -----END CERTIFICATE-----