Use pytorch/manylinuxaarch64-builder:cpu-aarch64 docker image (#3560)

Summary:
Use pytorch/manylinuxaarch64-builder:cpu-aarch64

Introduced in https://github.com/pytorch/builder/pull/1472

Pull Request resolved: https://github.com/pytorch/audio/pull/3560

Reviewed By: mthrok

Differential Revision: D48366572

Pulled By: atalman

fbshipit-source-id: 6de15f81abb09c737e6a1271226259483141e8f4

.github/workflows/ffmpeg.yml

@@ -46,7 +46,7 @@ jobs:
       repository: pytorch/audio
       runner: "linux.t4g.2xlarge"
       no-sudo: true
-      docker-image: quay.io/pypa/manylinux2014_aarch64
+      docker-image: pytorch/manylinuxaarch64-builder:cpu-aarch64
       script: |
         export FFMPEG_VERSION="${{ matrix.ffmpeg_version }}"
         export FFMPEG_ROOT="${PWD}/ffmpeg"