bpo-42385: [Enum] add `_generate_next_value_` to StrEnum (GH-23735)

The default for auto() is to return an integer, which doesn't work for `StrEnum`.  The new `_generate_next_value_` for `StrEnum` returns the member name, lower cased.
diff --git a/Lib/enum.py b/Lib/enum.py
index 74318c3..ed0c9ce 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -826,6 +826,12 @@ def __new__(cls, *values):
 
     __str__ = str.__str__
 
+    def _generate_next_value_(name, start, count, last_values):
+        """
+        Return the lower-cased version of the member name.
+        """
+        return name.lower()
+
 
 def _reduce_ex_by_name(self, proto):
     return self.name
diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index 7ca54e9..f245eb6 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -2179,6 +2179,12 @@ class Private(Enum):
         self.assertEqual(Private._Private__corporal, 'Radar')
         self.assertEqual(Private._Private__major_, 'Hoolihan')
 
+    def test_strenum_auto(self):
+        class Strings(StrEnum):
+            ONE = auto()
+            TWO = auto()
+        self.assertEqual([Strings.ONE, Strings.TWO], ['one', 'two'])
+
 
 class TestOrder(unittest.TestCase):