remove JSON since the hook breaks ipynb files

[njzjz]

Clang-format 19 breaks ipynb files. xref: llvm/llvm-project#110727 I can't find a way to exclude a format in pre-commit-mirror, so I remove the JSON format directly to ensure the hook doesn't break any files with the default configuration.

[asottile]

seems best for now to just override this in your own config (probably with exclude: ?) assuming this will get fixed upstream