Apply ruff rule RUF051

RUF051 Use `pop` instead of `key in dict` followed by `del dict[key]`

Author: DimitriPapadopoulos

distributed/cfexecutor.py

@@ -125,8 +125,7 @@ def map(self, fn, *iterables, **kwargs):
         if timeout is not None:
             timeout = parse_timedelta(timeout)
             end_time = timeout + time()
-        if "chunksize" in kwargs:
-            del kwargs["chunksize"]
+        kwargs.pop("chunksize", None)
         if kwargs:
             raise TypeError("unexpected arguments to map(): %s" % sorted(kwargs))