enum-deprecation: stop wrongly using deprecated

As for the previous commit, using deprecated actually change the source
Class leading all usage to raise deprecation warning. So we have to
remove the deprecated and keep the compatibility silently for a small
while.

swh/model/model.py

@@ -41,7 +41,6 @@ from attr._make import _AndValidator
 from attr.validators import and_
 from attrs_strict import AttributeTypeError
 import dateutil.parser
-from deprecated import deprecated
 import iso8601
 from typing_extensions import Final
 
@@ -987,9 +986,10 @@ class SnapshotTargetType(Enum):
         return f"SnapshotTargetType.{self.name}"
 
 
-TargetType = deprecated(version="v6.13.0", reason="Use model.SnapshotTargetType")(
-    SnapshotTargetType
-)
+# Remove this compatibility trick once all user have been migrated.
+#
+# We cannot use @deprecated as this would modify SnapshotTargetType directly
+TargetType = SnapshotTargetType
 
 
 class ReleaseTargetType(Enum):
@@ -1005,9 +1005,10 @@ class ReleaseTargetType(Enum):
         return f"ReleaseTargetType.{self.name}"
 
 
-ObjectType = deprecated(version="v6.13.0", reason="Use model.ReleaseTargetType")(
-    ReleaseTargetType
-)
+# Remove this compatibility trick once all user have been migrated.
+#
+# We cannot use @deprecated as this would modify SnapshotTargetType directly
+ObjectType = ReleaseTargetType
 
 
 @attr.s(frozen=True, slots=True, field_transformer=optimize_all_validators)