[CircleCI] Update GPU resource class (#1791)

Summary:
s/gpu.small/gpu.nvidia.medium/

Pull Request resolved: https://github.com/pytorch/audio/pull/1791

Reviewed By: mthrok

Differential Revision: D33697984

Pulled By: malfet

fbshipit-source-id: 0aacad6d4badf023753fa874c8b80c7f65170d0d

.circleci/config.yml

@@ -483,7 +483,7 @@ jobs:
     <<: *binary_common
     machine:
       image: ubuntu-1604-cuda-10.1:201909-23
-    resource_class: gpu.small
+    resource_class: gpu.nvidia.medium
     environment:
       <<: *environment
       image_name: pytorch/torchaudio_unittest_base:manylinux-cuda10.2-cudnn8-20210623

.circleci/config.yml.in

@@ -483,7 +483,7 @@ jobs:
     <<: *binary_common
     machine:
       image: ubuntu-1604-cuda-10.1:201909-23
-    resource_class: gpu.small
+    resource_class: gpu.nvidia.medium
     environment:
       <<: *environment
       image_name: pytorch/torchaudio_unittest_base:manylinux-cuda10.2-cudnn8-20210623