Correct entry for Python 3.12 in UnitTesting.yaml

Co-authored-by: Carol Abadeer <[email protected]>

Author: musicinmybrain

.github/workflows/UnitTesting.yaml

@@ -16,7 +16,7 @@ jobs:
       py39: 3.9
       py310: '3.10'
       py311: '3.11'
-      py311: '3.12'
+      py312: '3.12'
       DB_DATABASE: test_db
       DB_USER: root
       DB_PASSWORD: root