Bump torch from 1.6.0 to 1.8.0

Bumps [torch](https://github.com/pytorch/pytorch) from 1.6.0 to 1.8.0.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Commits](pytorch/pytorch@v1.6.0...v1.8.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -21,7 +21,7 @@ keras>=2.2.5
 tensorflow-addons~=0.11.0
 mxnet==1.6.0
 --find-links https://download.pytorch.org/whl/torch_stable.html
-torch==1.6.0
+torch==1.8.0
 torchaudio==0.6.0
 torchvision==0.7.0
 catboost==0.24.1