Let pre-commit sort pxd files too

In PyCQA#1494, it looks like support for `.pxd` files was added. However, these are currently ignored when running isort in pre-commit because there is `types: [python]`

.pre-commit-hooks.yaml

@@ -3,5 +3,6 @@
     entry: isort
     require_serial: true
     language: python
-    types: [python]
+    files: '.pxd$|.py$'
+    types: [file]
     args: ['--filter-files']