Exclude DurableContextProtocol from coverage

Author: ConnorKirk

aws_lambda_powertools/utilities/typing/lambda_context.py

@@ -96,7 +96,7 @@ def get_remaining_time_in_millis() -> int:
 
 
 @runtime_checkable
-class DurableContextProtocol(Protocol):
+class DurableContextProtocol(Protocol):  # pragma: no cover
     @property
     def lambda_context(self) -> LambdaContext: ...