Set proper permissions for jit.yml workflow (#118084)

Author: sobolevn

Diff for: .github/workflows/jit.yml

@@ -12,6 +12,9 @@ on:
       - 'Python/optimizer*.c'
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true