refactor(docs): Update SECURITY.md to mention opening GitHub security advisories (#3787)

fixes #3786

docs/SECURITY.md

@@ -16,31 +16,38 @@ running the latest version of Firezone at all times.
 
 ## Reporting a Vulnerability
 
-Please **do not** open a Github Issue for security issues you encounter.
-Instead, please send an email to `security AT firezone.dev` describing the issue
-and we'll respond as soon as possible.
+Please **do not** open a regular Github Issue for security issues you encounter.
+
+Instead do one of the following and we'll respond as soon as possible:
+
+- Open a GitHub security advisory by visiting:
+  https://github.com/firezone/firezone/security/advisories/new
+- Or, send an email to `security AT firezone.dev` describing the issue
 
 ## PGP Key
 
-You may use the public key below to encrypt emails to `security AT firezone.dev`.
-You can also find this key at:
+You may use the public key below to encrypt emails to
+`security AT firezone.dev`. You can also find this key at:
 
-https://pgp.mit.edu/pks/lookup?op=get&search=0x45113BA04AD83D8A
+https://keys.openpgp.org/vks/v1/by-fingerprint/250F8B56804107042DFC6A7345113BA04AD83D8A
 
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 ```