Fix typing

Author: fcollonval

exporter/opentelemetry-exporter-otlp-proto-common/src/opentelemetry/exporter/otlp/proto/common/_internal/metrics_encoder/__init__.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import logging
+from typing import List
 
 from opentelemetry.exporter.otlp.proto.common._internal import (
     _encode_attributes,
@@ -345,12 +346,12 @@ def _encode_metric(metric, pb2_metric):
         )
 
 
-def _encode_exemplars(sdk_exemplars: list[Exemplar]) -> list:
+def _encode_exemplars(sdk_exemplars: List[Exemplar]) -> List[pb2.Exemplar]:
     """
     Converts a list of SDK Exemplars into a list of protobuf Exemplars.
 
     Args:
-        sdk_exemplars (list): The list of exemplars from the OpenTelemetry SDK.
+        sdk_exemplars: The list of exemplars from the OpenTelemetry SDK.
 
     Returns:
         list: A list of protobuf exemplars.