Fix pre-commit linting (#3877)

Author: JasonGrace2282

manim/_config/utils.py

@@ -323,7 +323,7 @@ class MyScene(Scene): ...
     }
 
     def __init__(self) -> None:
-        self._d: dict[str, Any | None] = {k: None for k in self._OPTS}
+        self._d: dict[str, Any | None] = dict.fromkeys(self._OPTS)
 
     # behave like a dict
     def __iter__(self) -> Iterator[str]:

manim/mobject/graph.py

@@ -826,7 +826,7 @@ def _create_vertices(
             labels = {v: labels for v in vertices}
         else:
             assert isinstance(labels, dict)
-            base_labels = {v: False for v in vertices}
+            base_labels = dict.fromkeys(vertices, False)
             base_labels.update(labels)
             labels = base_labels