Fix Python 3.8 test regression

tests/test_enum.py

@@ -192,12 +192,15 @@ def test_binary_operators():
 
 
 def test_enum_to_int():
-    m.test_enum_to_int(m.Flags.Read)
-    m.test_enum_to_int(m.ClassWithUnscopedEnum.EMode.EFirstMode)
-    m.test_enum_to_uint(m.Flags.Read)
-    m.test_enum_to_uint(m.ClassWithUnscopedEnum.EMode.EFirstMode)
-    m.test_enum_to_long_long(m.Flags.Read)
-    m.test_enum_to_long_long(m.ClassWithUnscopedEnum.EMode.EFirstMode)
+    import sys
+    # Implicit conversion to integers is deprecated in Python >= 3.8
+    if sys.version_info < (3, 8):
+        m.test_enum_to_int(m.Flags.Read)
+        m.test_enum_to_int(m.ClassWithUnscopedEnum.EMode.EFirstMode)
+        m.test_enum_to_uint(m.Flags.Read)
+        m.test_enum_to_uint(m.ClassWithUnscopedEnum.EMode.EFirstMode)
+        m.test_enum_to_long_long(m.Flags.Read)
+        m.test_enum_to_long_long(m.ClassWithUnscopedEnum.EMode.EFirstMode)
 
 
 def test_duplicate_enum_name():