ci: fix auto-cancel (#196)

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

.github/workflows/ci.yml

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