feat!: Pytorch 1.9 version bump

BREAKING CHANGE: Updating PyTorch version to 1.9.0 which includes
breaking changes to the to_backend api

Signed-off-by: Naren Dasan <naren@narendasan.com>
Signed-off-by: Naren Dasan <narens@nvidia.com>

WORKSPACE

@@ -50,17 +50,17 @@ new_local_repository(
 http_archive(
     name = "libtorch",
     build_file = "@//third_party/libtorch:BUILD",
-    sha256 = "1f8aec376f9343538bd7c2fd3abb81ed3af11f575efe3aa72777c4d62044b832",
+    sha256 = "edc12091193ba772db77a6ec14e05cef6da881288fca0dfc89a031f631601f60",
     strip_prefix = "libtorch",
-    urls = ["https://download.pytorch.org/libtorch/cu111/libtorch-cxx11-abi-shared-with-deps-1.8.1%2Bcu111.zip"],
+    urls = ["https://download.pytorch.org/libtorch/cu111/libtorch-cxx11-abi-shared-with-deps-1.9.0%2Bcu111.zip"],
 )
 
 http_archive(
     name = "libtorch_pre_cxx11_abi",
     build_file = "@//third_party/libtorch:BUILD",
-    sha256 = "3a6e0dc11859111e75caa640c8ce9bf904fbb6e9992b4345e444ed5410e4d77e",
+    sha256 = "af9435fa4b44bb395c1a7645391c00228a72af4305f43a61e9300c0abdbe0819",
     strip_prefix = "libtorch",
-    urls = ["https://download.pytorch.org/libtorch/cu111/libtorch-shared-with-deps-1.8.1%2Bcu111.zip"],
+    urls = ["https://download.pytorch.org/libtorch/cu111/libtorch-shared-with-deps-1.9.0%2Bcu111.zip"],
 )
 
 # Download these tarballs manually from the NVIDIA website