Restore removed import (#2086)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: blink1073

Diff for: CHANGELOG.md

@@ -1416,6 +1416,7 @@ raw template
 {%- endblock in_prompt -%}
     """
 
+
 exporter_attr = AttrExporter()
 output_attr, _ = exporter_attr.from_notebook_node(nb)
 assert "raw template" in output_attr

Diff for: nbconvert/preprocessors/execute.py

@@ -7,6 +7,7 @@
 from jupyter_client.manager import KernelManager
 from nbclient.client import NotebookClient
 from nbclient.client import execute as _execute
+from nbclient.exceptions import CellExecutionError  # noqa: F401
 
 # Backwards compatibility for imported name
 # Copyright (c) IPython Development Team.

Diff for: pyproject.toml

@@ -221,10 +221,9 @@ ignore = [
   "RUF012", # Mutable class attributes should be annotated
 ]
 unfixable = [
-  # Don't touch print statements
-  "T201",
-  # Don't touch noqa lines
-  "RUF100",
+  "T201",   # Don't touch print statements
+  "RUF100", # Don't touch noqa lines
+  "F401",    # Unused imports
 ]
 
 [tool.ruff.lint.per-file-ignores]