Compatibility fix for newer NumPy versions

[alpozcan]

This fixes the below error (numpy version: 1.24.4)

Python 3.11.4 (main, Jul  2 2023, 13:30:56) [GCC 9.4.0] on linux
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>>> import brainforge as bf
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/a/Code/tradie/brainforge/brainforge/__init__.py", line 2, in <module>
    from brainforge.model import LayerStack
  File "/home/a/Code/tradie/brainforge/brainforge/model/__init__.py", line 1, in <module>
    from .layerstack import LayerStack
  File "/home/a/Code/tradie/brainforge/brainforge/model/layerstack.py", line 4, in <module>
    from ..layers.abstract_layer import LayerBase
  File "/home/a/Code/tradie/brainforge/brainforge/layers/__init__.py", line 1, in <module>
    from .core import Dense, Activation, Reshape, Flatten
  File "/home/a/Code/tradie/brainforge/brainforge/layers/core.py", line 3, in <module>
    from .. import atomic
  File "/home/a/Code/tradie/brainforge/brainforge/atomic/__init__.py", line 1, in <module>
    from .core_op import ReshapeOp, DenseOp
  File "/home/a/Code/tradie/brainforge/brainforge/atomic/core_op.py", line 6, in <module>
    s0 = scalX(0.)
         ^^^^^^^^^
  File "/home/a/Code/tradie/brainforge/brainforge/util/typing.py", line 11, in scalX
    return np.asscalar(np.array([scalar], dtype=dtype))
           ^^^^^^^^^^^
  File "/home/a/.local/lib/python3.11/site-packages/numpy/__init__.py", line 320, in __getattr__
    raise AttributeError("module {!r} has no attribute "
AttributeError: module 'numpy' has no attribute 'asscalar'. Did you mean: 'isscalar'?