Handle deprecation of scipy.misc

[agriyakhetarpal]

SciPy's age-old miscellaneous functions module has been deprecated since some time now (post 1.10, and we are at 1.14.1 at the time of writing). This raises a deprecation warning on import, coming from here:

autograd/autograd/scipy/misc.py

Lines 1 to 6 in 5c635f8

	import scipy.misc as osp_misc
	from ..scipy import special
	if hasattr(osp_misc, "logsumexp"):
	logsumexp = special.logsumexp

and we have an example that uses the imread function from here:

autograd/examples/fluidsim/fluidsim.py

Line 5 in 5c635f8

from scipy.misc import imread

These functions will be removed in SciPy v2, and the latter one here isn't documented anymore. We should avoid importing these functions, since we can import logsumexp from scipy.special anyway. In the case of the example, we can use either Pillow's or scikit-image's implementations.