Set minimal permissions to Github Workflows (#3972)

.github/workflows/macos.yml

@@ -9,6 +9,9 @@ on:
   pull_request:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
   cancel-in-progress: true