[infra] Fix fetch-sk and fetch-skps

Change-Id: I4b6a31e299eaabd4fdbb469272c3a9fd243a293e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/419776
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
2 files changed