chore(workflows): add read permissions for actions (#1681)

Author: homksei

.github/workflows/renovate-validation.yml

@@ -14,6 +14,9 @@ on:
       - .github/workflows/renovate-validation.yml
       - .github/renovate.json
 
+permissions:
+  contents: read
+
 jobs:
   validate:
     name: Renovate validation