Update codeql-action README to use v2 (#58)

Author: Mrtenz

README.md

@@ -26,6 +26,10 @@ jobs:
     uses: MetaMask/action-security-code-scanner/.github/workflows/security-scan.yml@v2
     with:
       scanner-ref: v2
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
 ```
 
 The workflow will:

packages/codeql-action/README.md

@@ -42,10 +42,10 @@ name: Security Scan
 on: [push, pull_request]
 
 jobs:
-  security:
-    uses: metamask/security-codescanner-monorepo/.github/workflows/security-scan.yml@main
+  security-scan:
+    uses: MetaMask/action-security-code-scanner/.github/workflows/security-scan.yml@v2
     with:
-      repo: ${{ github.repository }}
+      scanner-ref: v2
     permissions:
       actions: read
       contents: read