Add Python 3.9 build for 2.1 release (#5744)

Author: will-cromar

infra/tpu-pytorch-releases/artifacts.auto.tfvars

@@ -49,13 +49,22 @@ xrt_versioned_builds = [
 
 # Built on push to specific tag.
 versioned_builds = [
+ # Remove libtpu from PyPI builds
  {
  git_tag = "v2.1.0"
  pytorch_git_rev = "v2.1.0"
  package_version = "2.1.0"
  accelerator = "tpu"
  bundle_libtpu = "0"
  },
+ {
+ git_tag = "v2.1.0"
+ pytorch_git_rev = "v2.1.0"
+ package_version = "2.1.0"
+ accelerator = "tpu"
+ python_version = "3.9"
+ bundle_libtpu = "0"
+ },
  {
  git_tag = "v2.1.0"
  pytorch_git_rev = "v2.1.0"
@@ -64,6 +73,7 @@ versioned_builds = [
  python_version = "3.10"
  bundle_libtpu = "0"
  },
+ # Bundle libtpu for Kaggle
  {
  git_tag = "v2.1.0"
  pytorch_git_rev = "v2.1.0"