Update botorch

[marcosfelt]

See if that gets rid of these warnings

../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/cholesky.py:14
../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/cholesky.py:14
../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/cholesky.py:14
../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/cholesky.py:14
../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/cholesky.py:14
../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/cholesky.py:14
../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/cholesky.py:14
   /Users/Kobi/Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/cholesky.py:14: DeprecationWarning:gpytorch.utils.cholesky.psd_safe_cholesky is deprecated. Use linear_operator.utils.cholesky.psd_safe_cholesky instead.

../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/errors.py:15
../../../Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/errors.py:15
   /Users/Kobi/Library/Caches/pypoetry/virtualenvs/summit-TfmmV07p-py3.8/lib/python3.8/site-packages/gpytorch/utils/errors.py:15: DeprecationWarning:gpytorch.utils.errors.NotPSDError has been deprecated. Use linear_operator.utils.error.NotPSDError instead.