GH Actions: fix concurrency

The `concurrency` setting as-it-were, was cancelling builds which shouldn't be cancelled due to the "unique ID" including the `head_ref` (base branch), not the `ref` (current commit).

I believe this change will fix that.

Author: jrfnl

.github/workflows/cs.yml

@@ -9,7 +9,7 @@ on:
 # Cancels all previous workflow runs for the same branch that have not yet completed.
 concurrency:
   # The concurrency group contains the workflow name and the branch name.
-  group: ${{ github.workflow }}-${{ github.head_ref }}
+  group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:

.github/workflows/test.yml

@@ -9,7 +9,7 @@ on:
 # Cancels all previous workflow runs for the same branch that have not yet completed.
 concurrency:
   # The concurrency group contains the workflow name and the branch name.
-  group: ${{ github.workflow }}-${{ github.head_ref }}
+  group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs: