isort fix and update pre-commit config

Author: kkraus14

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
       - repo: https://github.com/timothycrosley/isort
-        rev: 4.3.21
+        rev: 5.0.4
         hooks:
               - id: isort
       - repo: https://github.com/ambv/black

python/setup.py

@@ -4,11 +4,12 @@
 import sysconfig
 from distutils.sysconfig import get_python_lib
 
-import versioneer
 from Cython.Build import cythonize
 from setuptools import find_packages, setup
 from setuptools.extension import Extension
 
+import versioneer
+
 install_requires = ["numba", "cython"]
 cython_lib = ["rmm/_lib/**/*.pyx"]
 cython_tests = ["rmm/tests/**/*.pyx"]