Update SECURITY.md to include PNPM in vulnerability scanning and add SAST tools for Go and JavaScript code.

SECURITY.md

@@ -4,7 +4,12 @@ If you have discovered a security vulnerability, please refer to [our website](h
 
 ## Vulnerability Management
 
-- We use [OSV](https://osv.dev/) to scan for package vulnerabilities in our dependencies.
+- We use PNPM and [OSV](https://osv.dev/) to scan for package vulnerabilities in our dependencies.
+
+## SAST
+
+- Gosec for Go code.
+- ESLint with eslint-plugin-security for JavaScript code.
 
 ## Dependency and Supply Chain