pre-commit: Don't clang-format json files

Not until I find out how to make vscode use clang-format for
json. It seems to be using its own formatter.

.pre-commit-config.yaml

@@ -16,6 +16,7 @@ repos:
   rev: v14.0.0
   hooks:
   - id: clang-format
+    exclude: (.json)
 - repo: https://github.com/PyCQA/pylint
   rev: v2.12.2
   hooks: