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

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

Author: pre-commit-ci[bot]

mdit_py_plugins/dollarmath/index.py

@@ -78,7 +78,9 @@ def dollarmath_plugin(
     _label_renderer: Callable[[str], str]
     if label_renderer is None:
         _label_renderer = (  # noqa: E731
-            lambda label: f'<a href="#{label}" class="mathlabel" title="Permalink to this equation">¶</a>'
+            lambda label: (
+                f'<a href="#{label}" class="mathlabel" title="Permalink to this equation">¶</a>'
+            )
         )
     else:
         _label_renderer = label_renderer