Add recognition of numpy.concatenate's dtype parameter

[cfriedland5]

Astroid's understanding of numpy.concatenate's signature is missing the dtype parameter, which numpy has provided since 1.20.

astroid/astroid/brain/brain_numpy_core_multiarray.py

Lines 42 to 43 in fe45efe

	"concatenate": """def concatenate(arrays, axis=None, out=None):
	return numpy.ndarray((0, 0))""",

It is also missing the casting parameter and it probably makes sense to address both in the same PR.