Augh missing quote

Author: multiplemonomials

.github/workflows/test_building_multiple_executables.yml

@@ -20,7 +20,7 @@ jobs:
           
           python3 -m pip install -e ./tools
           
-          python -c "import os, site; print(os.path.join(site.USER_BASE, 'Scripts' if os.name == 'nt' else 'bin'))
+          python -c "import os, site; print(os.path.join(site.USER_BASE, 'Scripts' if os.name == 'nt' else 'bin'))"
 
       # Note: For this CI job we use MBED_CREATE_PYTHON_VENV=FALSE so that we can make sure
       # this mode works.