Update test_stable.yml (#235)

Author: jorgensd

.github/workflows/test_stable.yml

@@ -21,6 +21,8 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: release
 
       - uses: ./.github/actions/install-dependencies