fix type annotation of .shape (#38)

tunits/core/__init__.pyi

@@ -2,7 +2,6 @@ from typing import ClassVar, Sequence, Any, Callable, Iterator, overload, Generi
 import abc
 from attrs import frozen
 from typing_extensions import TypeVar
-from numpy._typing import _ShapeLike
 from numpy.typing import NDArray, DTypeLike
 import numpy as np
 
@@ -337,7 +336,7 @@ class ValueArray(Generic[ValueType2], WithUnit):
     @property
     def ndim(self) -> int: ...
     @property
-    def shape(self) -> _ShapeLike: ...
+    def shape(self) -> tuple[int, ...]: ...
     def __abs__(self: ArrayType) -> ArrayType: ...
     def __divmod__(self: ArrayType, other: Any) -> tuple[_NUMERICAL_TYPE_OR_ARRAY, ArrayType]: ...
     def __add__(self: ArrayType, other: Any) -> ArrayType: ...