Run ruff format

It's unfortunate that a patch version (ruff 0.14.10) introduced
a formatting change, although in preview mode only:
	astral-sh/ruff#21369

Author: DimitriPapadopoulos

docs/.hooks/render_default_test_env.py

@@ -51,7 +51,8 @@ def get_scripts_toml():
 class TestEnvDefaultsPreprocessor(Preprocessor):
     def run(self, lines):  # noqa: PLR6301
         return (
-            "\n".join(lines)
+            "\n"
+            .join(lines)
             .replace(MARKER_DEPENDENCIES, get_dependencies_toml())
             .replace(MARKER_MATRIX, get_matrix_toml())
             .replace(MARKER_SCRIPTS, get_scripts_toml())

docs/.hooks/render_ruff_defaults.py

@@ -136,7 +136,8 @@ def get_per_file_ignored_rules():
 class RuffDefaultsPreprocessor(Preprocessor):
     def run(self, lines):  # noqa: PLR6301
         return (
-            "\n".join(lines)
+            "\n"
+            .join(lines)
             .replace(MARKER_VERSION, get_ruff_version())
             .replace(MARKER_STABLE_RULES_COUNT, get_stable_rules_count())
             .replace(MARKER_PREVIEW_RULES_COUNT, get_preview_rules_count())