fix: use unparametrized types in direct assignment

Author: d-v-b

src/zarr/core/dtype/_numpy.py

@@ -524,7 +524,7 @@ def from_json_value(self, data: JSON, *, zarr_format: ZarrFormat) -> np.bytes_:
 
 @dataclass(frozen=True, kw_only=True)
 class FixedLengthBytes(DTypeWrapper[np.dtypes.VoidDType[Any], np.void]):
-    dtype_cls = np.dtypes.VoidDType[Any]
+    dtype_cls = np.dtypes.VoidDType
     _zarr_v3_name = "r*"
     item_size_bits: ClassVar[int] = 8
     length: int = 1
@@ -591,8 +591,8 @@ def from_json_value(self, data: JSON, *, zarr_format: ZarrFormat) -> np.void:
 
 @dataclass(frozen=True, kw_only=True)
 class FixedLengthUnicodeString(DTypeWrapper[np.dtypes.StrDType[int], np.str_]):
-    dtype_cls = np.dtypes.StrDType[int]
-    _zarr_v3_name = "numpy.static_unicode_string"
+    dtype_cls = np.dtypes.StrDType
+    _zarr_v3_name = "numpy.fixed_length_unicode_string"
     item_size_bits: ClassVar[int] = 32  # UCS4 is 32 bits per code point
     endianness: Endianness | None = "native"
     length: int = 1