Update tests.yml

Author: Gabriel-Darbord

.github/workflows/tests.yml

@@ -10,5 +10,5 @@ jobs:
   run:
     uses: moosetechnology/.github/.github/workflows/run-tests.yml@main
     with:
-      pharo-versions: '["Pharo64-13", "Pharo64-14"]'
+      pharo-versions: "['Pharo64-13', 'Pharo64-14']"
     secrets: inherit