[infra] Roll back infra dep

https://skia-review.googlesource.com/c/skia/+/416576 updated this, which
updated Python to 3.9, which fails on the CommandBuffer tasks.

Change-Id: I916738237dfee08a584c09af08e9bf735ac255cb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/430038
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
3 files changed