Add missing quote

Author: koppor

.github/workflows/check.yml

@@ -8,7 +8,7 @@ on:
   workflow_dispatch:
 
 concurrency:
-  group: "${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  group: "${{ github.workflow }}-${{ github.head_ref || github.ref }}"
   cancel-in-progress: true
 
 jobs: