Address review comments

Add pyproject.toml and setup.cfg as well for completeness.

Co-Authored-By: Anthony Sottile <asottile@umich.edu>

.pre-commit-hooks.yaml

@@ -3,4 +3,4 @@
   description: Automatically compile requirements.
   entry: pip-compile
   language: python
-  files: (requirements\.in|setup\.py)$
+  files: (^pyproject\.toml|requirements\.in|^setup\.(cfg|py))$