Update Root Certificate (#7932)

The root certificate used in the example to connect to api.github.com has expired.
A new certificate was issued on March 3, 2021 and should be valid for a year.

Author: polygonie

Diff for: libraries/ESP8266WiFi/examples/HTTPSRequest/HTTPSRequest.ino

@@ -28,27 +28,33 @@ const int httpsPort = 443;
 // DigiCert High Assurance EV Root CA
 const char trustRoot[] PROGMEM = R"EOF(
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 )EOF";
 X509List cert(trustRoot);