Update pre-commit config file exclusions

This brings in an update from the exemplar copy that ensures that the
pre-commit hooks don't invalidate the infra/ submodule.

Author: ednolan

.pre-commit-config.yaml

@@ -39,4 +39,4 @@ repos:
     hooks:
       - id: codespell
 
-exclude: 'cookiecutter/'
+exclude: 'cookiecutter/|infra/'