Fix Depth.encode_absolute

[anhtu293]

General description of your pull request with the list of new features and/or bugs.

• Fix bug X : depth.encode_absolute has bug in dimension in torch1.13. Depth.encode_absolute has error in torch1.13 #337

• How to fix: remove unsqueeze in encode_abosolute
• Result after fixing

>>> from aloscene import Depth
>>> import torch
>>> depth = Depth(torch.zeros((1, 128, 128)), is_absolute=False)
>>> depth.encode_absolute()
tensor(
	scale=1
	shift=0
	distortion=1.0
	is_planar=True
	is_absolute=True
	projection=pinhole
	[[[100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         ...,
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.]]])
>>> depth.encode_absolute(keep_negative=True)
tensor(
	scale=1
	shift=0
	distortion=1.0
	is_planar=True
	is_absolute=True
	projection=pinhole
	[[[100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         ...,
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.],
         [100000000., 100000000., 100000000.,  ..., 100000000.,
          100000000., 100000000.]]])
>>> 

---

This pull request includes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[Data-Iab]

The unsqueeze was there due the a low level torch __getitem__ issue in the previous versions. Thanks for fixing