Manual roll of Infra into Skia

Updated go.mod/go.sum:
$ go get go.skia.org/infra@bf5977977c1ee3397698818cf9ef21ea17cbabe4
$ go mod download
$ make -C infra/bots train

Updated go_repositories.bzl with:
$ bazel run //:gazelle -- update-repos -from_file=go.mod -to_macro=go_repositories.bzl%go_repositories

Fixed task drivers after the above steps.

Manual roll includes these changes: https://skia.googlesource.com/buildbot.git/+log/51b3cbc90f03..bf59779

Change-Id: I4c783b867a9d75cfeb17697279d871266ec8ab1b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/612256
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
5 files changed