[infra] Fix go.sum

I just ran `go mod download`

Change-Id: Ic9b07bfa6da2e0c75e9f2580f8c71f23a361e6de
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/535117
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed