[3.11] GH-99155: Fix NormalDist pickle with 0 and 1 protocols (GH-99156). (GH-99188)

(cherry picked from commit d7a00f1e8e)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

Automerge-Triggered-By: GH:rhettinger

Lib/statistics.py

@@ -1382,3 +1382,9 @@ class NormalDist:
 
     def __repr__(self):
         return f'{type(self).__name__}(mu={self._mu!r}, sigma={self._sigma!r})'
+
+    def __getstate__(self):
+        return self._mu, self._sigma
+
+    def __setstate__(self, state):
+        self._mu, self._sigma = state