[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

docs/extensions/check_events.py

@@ -1,4 +1,5 @@
 """Check events.yaml and blog posts are consistent."""
+
 from __future__ import annotations
 
 from pathlib import Path

docs/extensions/legacy_redirects.py

@@ -3,6 +3,7 @@
 The logic works similar to sphinx.rediraffe, but handles adding index.html
 for end-points.
 """
+
 import json
 from os.path import relpath
 from pathlib import Path

docs/extensions/selective_css.py

@@ -1,4 +1,5 @@
 """Add CSS selectively to pages"""
+
 from sphinx.application import Sphinx