[2.2.x] Fixed #30479 -- Fixed detecting changes in manage.py by autoreloader when using StatReloader.

Regression in c8720e7696.

Backport of b2790f74d4 from master

django/utils/autoreload.py

@@ -111,7 +111,15 @@ def iter_modules_and_files(modules, extra_files):
         # During debugging (with PyDev) the 'typing.io' and 'typing.re' objects
         # are added to sys.modules, however they are types not modules and so
         # cause issues here.
-        if not isinstance(module, ModuleType) or getattr(module, '__spec__', None) is None:
+        if not isinstance(module, ModuleType):
+            continue
+        if module.__name__ == '__main__':
+            # __main__ (usually manage.py) doesn't always have a __spec__ set.
+            # Handle this by falling back to using __file__, resolved below.
+            # See https://docs.python.org/reference/import.html#main-spec
+            sys_file_paths.append(module.__file__)
+            continue
+        if getattr(module, '__spec__', None) is None:
             continue
         spec = module.__spec__
         # Modules could be loaded from places without a concrete location. If