fix: fix event webhook for updated starbank-ecdsa dependency

Author: JenniferMah

sendgrid/helpers/eventwebhook/__init__.py

@@ -27,7 +27,7 @@ def convert_public_key_to_ecdsa(self, public_key):
         :return: public key using the ECDSA algorithm
         :rtype PublicKey
         """
-        return PublicKey.fromPem(public_key)
+        return PublicKey.fromPem('\n-----BEGIN PUBLIC KEY-----\n'+public_key+'\n-----END PUBLIC KEY-----\n')
 
     def verify_signature(self, payload, signature, timestamp, public_key=None):
         """