Enable and apply ruff fule RUF009

RUF009 Do not perform function call `cast` in dataclass defaults

Author: DimitriPapadopoulos

pyproject.toml

@@ -177,7 +177,6 @@ extend-select = [
 ignore = [
     "RUF003",
     "RUF005",
-    "RUF009",
     "RUF012",
     "RUF015",
 ]

src/zarr/metadata.py

@@ -310,7 +310,7 @@ class ArrayV2Metadata(ArrayMetadata):
     filters: list[dict[str, JSON]] | None = None
     dimension_separator: Literal[".", "/"] = "."
     compressor: dict[str, JSON] | None = None
-    attributes: dict[str, JSON] = cast(dict[str, JSON], field(default_factory=dict))
+    attributes: dict[str, JSON] = field(default_factory=dict)
     zarr_format: Literal[2] = field(init=False, default=2)
 
     def __init__(