use {} instead of dict() (#695)

instrumentation/opentelemetry-instrumentation-celery/src/opentelemetry/instrumentation/celery/utils.py

@@ -131,7 +131,7 @@ def attach_span(task, task_id, span, is_publish=False):
     """
     span_dict = getattr(task, CTX_KEY, None)
     if span_dict is None:
-        span_dict = dict()
+        span_dict = {}
         setattr(task, CTX_KEY, span_dict)
 
     span_dict[(task_id, is_publish)] = span

instrumentation/opentelemetry-instrumentation-sklearn/src/opentelemetry/instrumentation/sklearn/__init__.py

@@ -194,7 +194,7 @@ def get_base_estimators(packages: List[str]) -> Dict[str, Type[BaseEstimator]]:
         A dictionary of qualnames and classes inheriting from
         ``BaseEstimator``.
     """
-    klasses = dict()
+    klasses = {}
     for package_name in packages:
         lib = import_module(package_name)
         package_dir = os.path.dirname(lib.__file__)