Fix for advanced_ota_redirect_url example failure in CI

examples/system/ota/advanced_https_ota/test_certs/server_cert.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
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+lFJJey33KFrAf5vnV9qcyWFIo7PYy2VsaaEjFeefr7q3sTFSMlJeadexW2Y=
+-----END CERTIFICATE-----

examples/system/ota/advanced_https_ota/test_certs/server_key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----