Add issues write permission to untriaged label workflow (#959)

Signed-off-by: shreyah963 <shreyab963@gmail.com>

Author: shreyah963

.github/workflows/add-untriaged.yml

@@ -4,6 +4,9 @@ on:
   issues:
     types: [opened, reopened, transferred]
 
+permissions:
+  issues: write
+
 jobs:
   apply-label:
     runs-on: ubuntu-latest