Merge pull request #1268 from gcmoreira/fix_constants_imports

Fix changes introduced to volatility3.framework.constants in PRs #838

volatility3/framework/constants/__init__.py

@@ -134,4 +134,5 @@ def __getattr__(name):
     ]:
         warnings.warn(f"{name} is deprecated", FutureWarning)
         return globals()[f"{deprecated_tag}{name}"]
-    return None
+
+    return getattr(__import__(__name__), name)