Reformat file with black

Reformat the `__init__.py` file in the Celery instrumentation using
`black`, fixing a CI linter error.

Author: unflxw

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

@@ -67,7 +67,9 @@ def add(x, y):
 from billiard.einfo import ExceptionInfo
 
 try:
-    from billiard.einfo import ExceptionWithTraceback # pylint: disable=no-name-in-module
+    from billiard.einfo import (
+        ExceptionWithTraceback,
+    )  # pylint: disable=no-name-in-module
 except ImportError:
     ExceptionWithTraceback = None
 
@@ -279,10 +281,7 @@ def _trace_failure(*args, **kwargs):
         if ex is not None:
             # Unwrap the actual exception wrapped by billiard's
             # `ExceptionInfo` and `ExceptionWithTraceback`.
-            if (
-                isinstance(ex, ExceptionInfo)
-                and ex.exception is not None
-            ):
+            if isinstance(ex, ExceptionInfo) and ex.exception is not None:
                 ex = ex.exception
 
             if (