[meta] update security policy to use GitHub PVR instead of Tidelift

Author: ljharb

SECURITY.md

@@ -1,6 +1,6 @@
 # Security
 
-Please file a private vulnerability via GitHub, email [@ljharb](https://github.com/ljharb), or see https://tidelift.com/security if you have a potential security vulnerability to report.
+Please [file a private vulnerability report](https://github.com/browserify/resolve/security/advisories/new), or email [@ljharb](https://github.com/ljharb), if you have a potential security vulnerability to report.
 
 ## Incident Response