Change dict encoding file

Author: jeromekelleher

prek.toml

@@ -1,6 +1,7 @@
 
 files = { glob = [
     "msprime/*.py",
+    "benchmarks/*",
     "tests/*.py",
     "*.toml",
     "docs/*",

tests/test_dict_encoding.py

@@ -1,9 +1,9 @@
 # Test cases for the low-level dictionary encoding used to move
 # data around in C.
 import lwt_interface.dict_encoding_testlib
-from msprime import _msprime
+import msprime
 
-lwt_interface.dict_encoding_testlib.lwt_module = _msprime
+lwt_interface.dict_encoding_testlib.lwt_module = msprime._msprime
 
 # Bring the tests defined in dict_encoding_testlib into the current namespace
 # so pytest will find and execute them.