syntax fix

Author: JuliaSprenger

.github/workflows/io-test.yml

@@ -7,9 +7,9 @@ on:
         required: true
         type: string
 
-  concurrency:  # Cancel previous workflows on the same pull request
-    group: ${{ github.workflow }}-${{ github.ref }}
-    cancel-in-progress: true
+concurrency:  # Cancel previous workflows on the same pull request
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build-and-test: