revert: types changes

Signed-off-by: Aaron Pham <29749331+aarnphm@users.noreply.github.com>

bentoml/_internal/io_descriptors/base.py

@@ -5,12 +5,13 @@
 from abc import abstractmethod
 from typing import TYPE_CHECKING
 
+from starlette.requests import Request
+from starlette.responses import Response
+
 if TYPE_CHECKING:
     from types import UnionType
 
     from typing_extensions import Self
-    from starlette.requests import Request
-    from starlette.responses import Response
 
     from bentoml.grpc.v1.service_pb2 import Request as GRPCRequest
     from bentoml.grpc.v1.service_pb2 import Response as GRPCResponse
@@ -19,13 +20,6 @@
     from ..context import InferenceApiContext as Context
     from ..server.grpc.types import BentoServicerContext
 
-    InputType = (
-        UnionType
-        | t.Type[t.Any]
-        | LazyType[t.Any]
-        | dict[str, t.Type[t.Any] | UnionType | LazyType[t.Any]]
-    )
-
 
 IOPyObj = t.TypeVar("IOPyObj")
 
@@ -81,19 +75,26 @@ def accepted_proto_fields(self) -> list[str]:
         return self._proto_fields
 
     @abstractmethod
-    def input_type(self) -> InputType:
+    def input_type(
+        self,
+    ) -> t.Union[
+        "UnionType",
+        t.Type[t.Any],
+        "LazyType[t.Any]",
+        t.Dict[str, t.Union[t.Type[t.Any], "UnionType", "LazyType[t.Any]"]],
+    ]:
         ...
 
     @abstractmethod
-    def openapi_schema_type(self) -> dict[str, str]:
+    def openapi_schema_type(self) -> t.Dict[str, str]:
         ...
 
     @abstractmethod
-    def openapi_request_schema(self) -> dict[str, t.Any]:
+    def openapi_request_schema(self) -> t.Dict[str, t.Any]:
         ...
 
     @abstractmethod
-    def openapi_responses_schema(self) -> dict[str, t.Any]:
+    def openapi_responses_schema(self) -> t.Dict[str, t.Any]:
         ...
 
     @abstractmethod