pre-commit-config: update isort

Fixes error:

    RuntimeError: The Poetry configuration is invalid:
      - [extras.pipfile_deprecated_finder.2] 'pip-shims<=0.3.4' does not match '^[a-zA-Z-_.0-9]+$'

Signed-off-by: Benjamin Gilbert <bgilbert@cs.cmu.edu>

Author: bgilbert

.pre-commit-config.yaml

@@ -21,7 +21,7 @@ repos:
         args: ["--py37-plus"]
 
   - repo: https://github.com/PyCQA/isort
-    rev: 5.10.1
+    rev: 5.12.0
     hooks:
       - id: isort
         name: Reorder python imports with isort