fix: harden workflow permissions with deny-all top-level and least-privilege job scopes (#482)

.github/workflows/action-security.yml

@@ -17,10 +17,7 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
-permissions:
-  contents: read
-  actions: read
-  pull-requests: read
+permissions: {}
 
 jobs:
   analyze:
@@ -29,6 +26,9 @@ jobs:
     timeout-minutes: 30
 
     permissions:
+      contents: read
+      actions: read
+      pull-requests: read
       security-events: write
       statuses: write
       issues: write