fix: exclude .ipynb from ruff pre-commit hook (#4521)

The ruff pre-commit hook runs on all file types by default, including
.ipynb notebooks. Colab notebooks are authored in Colab's editor and
can contain IPython magics (%cd, !git) that ruff cannot parse. This
causes pre-commit.ci to fail on unrelated PRs when a notebook on main
has syntax ruff does not understand.

Add `exclude: '\.ipynb$'` to the ruff hook so notebooks are skipped.

.pre-commit-config.yaml

@@ -6,6 +6,7 @@ repos:
         args:
           - --fix
           - --exit-non-zero-on-fix
+        exclude: '\.ipynb$'
   - repo: local
     hooks:
       - id: ruff-format-with-kwargs