Replace reorder-python-imports by isort

Unfortunately `black` and `reorder-python-imports` are no longer compatible between each other, and will not be in the foreseeable feature:

asottile/reorder-python-imports#367
asottile/reorder-python-imports#366
psf/black#4175

Drop `reorder-python-imports` in favor of `isort`.

.pre-commit-config.yaml

@@ -16,11 +16,12 @@ repos:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
     -   id: debug-statements
--   repo: https://github.com/asottile/reorder-python-imports
-    rev: v3.12.0
+-   repo: https://github.com/pycqa/isort
+    rev: 5.13.2
     hooks:
-    -   id: reorder-python-imports
-        args: ['--application-directories=.:src', --py36-plus]
+      - id: isort
+        name: isort
+        args: ["--force-single-line", "--line-length=100", "--profile=black"]
 -   repo: local
     hooks:
     -   id: rst