Bump lightgbm from 3.2.0 to 3.2.1

Bumps [lightgbm](https://github.com/microsoft/LightGBM) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/microsoft/LightGBM/releases)
- [Commits](microsoft/LightGBM@v3.2.0...v3.2.1)

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

Author: dependabot[bot]

requirements.txt

@@ -30,7 +30,7 @@ torchaudio==0.8.1 -f https://download.pytorch.org/whl/torch_stable.html
 torchvision==0.9.1 -f https://download.pytorch.org/whl/torch_stable.html
 catboost==0.25.1
 GPy==1.9.9
-lightgbm==3.2.0
+lightgbm==3.2.1
 xgboost==1.3.3
 kornia~=0.5.0