Numpy doesn't support anymore streamline plot

[ArthurTlprt]

I tried running the streamline example in the doc, but it raised a warning and the figure was not plot:

import plotly.figure_factory as ff

import numpy as np

x = np.linspace(-3, 3, 100)
y = np.linspace(-3, 3, 100)
Y, X = np.meshgrid(x, y)

print(type(Y))
print(Y.shape)

u = -1 - X**2 + Y
v = 1 + X - Y**2

# Create streamline figure
fig = ff.create_streamline(x, y, u, v, arrow_scale=.1)
fig.show()

---------------------------------------------------------------------------
PendingDeprecationWarning                 Traceback (most recent call last)
Cell In[15], line 16
    13 v = 1 + X - Y**2
    15 # Create streamline figure
---> 16 fig = ff.create_streamline(x, y, u, v, arrow_scale=.1)
    17 fig.show()

File [~/Documents/pyrotor/env/lib/python3.9/site-packages/plotly/figure_factory/_streamline.py:117](https://file+.vscode-resource.vscode-cdn.net/home/arthur/Documents/pyrotor/examples/~/Documents/pyrotor/env/lib/python3.9/site-packages/plotly/figure_factory/_streamline.py:117), in create_streamline(x, y, u, v, density, angle, arrow_scale, **kwargs)
   114 validate_streamline(x, y)
   115 utils.validate_positive_scalars(density=density, arrow_scale=arrow_scale)
--> 117 streamline_x, streamline_y = _Streamline(
   118     x, y, u, v, density, angle, arrow_scale
   119 ).sum_streamlines()
   120 arrow_x, arrow_y = _Streamline(
   121     x, y, u, v, density, angle, arrow_scale
   122 ).get_streamline_arrows()
   124 streamline = graph_objs.Scatter(
   125     x=streamline_x + arrow_x, y=streamline_y + arrow_y, mode="lines", **kwargs
   126 )

File [~/Documents/pyrotor/env/lib/python3.9/site-packages/plotly/figure_factory/_streamline.py:170](https://file+.vscode-resource.vscode-cdn.net/home/arthur/Documents/pyrotor/examples/~/Documents/pyrotor/env/lib/python3.9/site-packages/plotly/figure_factory/_streamline.py:170), in _Streamline.__init__(self, x, y, u, v, density, angle, arrow_scale, **kwargs)
   168 self.get_streamlines()
   169 streamline_x, streamline_y = self.sum_streamlines()
--> 170 arrows_x, arrows_y = self.get_streamline_arrows()

File [~/Documents/pyrotor/env/lib/python3.9/site-packages/plotly/figure_factory/_streamline.py:385](https://file+.vscode-resource.vscode-cdn.net/home/arthur/Documents/pyrotor/examples/~/Documents/pyrotor/env/lib/python3.9/site-packages/plotly/figure_factory/_streamline.py:385), in _Streamline.get_streamline_arrows(self)
   382 space[:] = np.nan
   384 # Combine arrays into matrix
--> 385 arrows_x = np.matrix([point1_x, arrow_end_x, point2_x, space])
   386 arrows_x = np.array(arrows_x)
   387 arrows_x = arrows_x.flatten("F")

File [~/Documents/pyrotor/env/lib/python3.9/site-packages/numpy/matrixlib/defmatrix.py:116](https://file+.vscode-resource.vscode-cdn.net/home/arthur/Documents/pyrotor/examples/~/Documents/pyrotor/env/lib/python3.9/site-packages/numpy/matrixlib/defmatrix.py:116), in matrix.__new__(subtype, data, dtype, copy)
   115 def __new__(subtype, data, dtype=None, copy=True):
--> 116     warnings.warn('the matrix subclass is not the recommended way to '
   117                   'represent matrices or deal with linear algebra (see '
   118                   'https://docs.scipy.org/doc/numpy/user/'
   119                   'numpy-for-matlab-users.html). '
   120                   'Please adjust your code to use regular ndarray.',
   121                   PendingDeprecationWarning, stacklevel=2)
   122     if isinstance(data, matrix):
   123         dtype2 = data.dtype

PendingDeprecationWarning: the matrix subclass is not the recommended way to represent matrices or deal with linear algebra (see https://docs.scipy.org/doc/numpy/user/numpy-for-matlab-users.html). Please adjust your code to use regular ndarray.```

[alexcjohnson]

Closed by #4233 - thanks!