Sort imports

Using pytest's style.

src/xdist/scheduler/loadscope.py

@@ -1,6 +1,7 @@
 from collections import OrderedDict
 
 from _pytest.runner import CollectReport
+
 from xdist.remote import Producer
 from xdist.report import report_collection_diff
 from xdist.workermanage import parse_spec_config