Use Tuple instead of tuple for typing

Signed-off-by: Mynhardt Burger <[email protected]>

caikit_tgis_backend/tgis_backend.py

@@ -16,7 +16,7 @@
 # Standard
 from copy import deepcopy
 from threading import Lock
-from typing import Any, Dict, Optional, Union
+from typing import Any, Dict, Optional, Tuple, Union
 
 # Third Party
 import grpc
@@ -431,7 +431,7 @@ def _request_header_get(cls, request: fastapi.Request, key: str) -> Optional[str
         If no matching header was found return None.
         """
         # https://github.com/encode/starlette/blob/5ed55c441126687106109a3f5e051176f88cd3e6/starlette/datastructures.py#L543
-        items: list[tuple[str, str]] = request.headers.items()
+        items: list[Tuple[str, str]] = request.headers.items()
         get_header_key = key.lower()
 
         for header_key, header_value in items:
@@ -440,7 +440,7 @@ def _request_header_get(cls, request: fastapi.Request, key: str) -> Optional[str
 
     @classmethod
     def _request_metadata_get(
-        cls, metadata: tuple[str, Union[str, bytes]], key: str
+        cls, metadata: Tuple[str, Union[str, bytes]], key: str
     ) -> Optional[str]:
         """
         Returns the first matching value for the metadata key (case insensitive).

tests/test_tgis_backend.py

@@ -18,7 +18,7 @@
 # Standard
 from copy import deepcopy
 from dataclasses import asdict
-from typing import Any, Dict, Optional, Sequence, Union
+from typing import Any, Dict, Optional, Sequence, Tuple, Union
 from unittest import mock
 import os
 import tempfile
@@ -105,7 +105,7 @@ class TestServicerContext(grpc.ServicerContext):
     def __init__(self, metadata: Dict[str, Union[str, bytes]]):
         self.metadata = metadata
 
-    def invocation_metadata(self) -> Sequence[tuple[str, Union[str, bytes]]]:
+    def invocation_metadata(self) -> Sequence[Tuple[str, Union[str, bytes]]]:
         # https://grpc.github.io/grpc/python/glossary.html#term-metadata
         return list(self.metadata.items())