Mark instrumentation_scope as optional

opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py

@@ -755,7 +755,7 @@ def __init__(
         record_exception: bool = True,
         set_status_on_exception: bool = True,
         limits=_UnsetLimits,
-        instrumentation_scope: InstrumentationScope = None,
+        instrumentation_scope: Optional[InstrumentationScope] = None,
     ) -> None:
         if resource is None:
             resource = Resource.create({})