fix: correct syntax error in f-string and enhance compatibility with Python 3.9 to 3.11

Author: atellaluca

examples/import_validation/developer_code.py

@@ -26,6 +26,7 @@ class MyLibrarySpy(SpyModel):
 # Dynamically import the module and check if it complies with the rules
 try:
     module = spy.importspy(spymodel=MyLibrarySpy)
-    print(f"Module {"/".join(module.__file__.split('/')[-2:])} is using your library correctly!")
+    filename = "/".join(module.__file__.split('/')[-2:])
+    print(f"Module {filename} is using your library correctly!")
 except ValueError as ve:
     print("Something wrong: ", ve)