Update PGP Key link (#74)

SECURITY.md

@@ -10,7 +10,7 @@ At the European Commission, we treat the security of our Communication and Infor
 ## If you have identified a vulnerability, please do the following
 
 - E-mail your findings to <[email protected]>, specifying whether or not you agree to your name or pseudonym being made publicly available as the discoverer of the problem.
-- Encrypt your findings using our [PGP key](https://pgp.mit.edu/pks/lookup?op=get&search=0x6773AACDF09F6628) to prevent this critical information from falling into the wrong hands.
+- Encrypt your findings using our [PGP key](https://ec.europa.eu/assets/digit/pgpkey/ec-vulnerability-disclosure-pgp.txt) to prevent this critical information from falling into the wrong hands.
 - Provide us with sufficient information to reproduce the problem so that we can resolve it as quickly as possible. Usually, the IP address or the URL of the affected system and a description of the vulnerability will be sufficient, but complex vulnerabilities may require further explanation in terms of technical information or potential proof-of-concept code.
 - Provide your report in English, preferably, or in any other official language of the European Union.
 - Inform us if you agree to make your name/pseudonym publicly available as the discoverer of the vulnerability.