[infra] Update dep of infra repo

This was needed to pick up reviews.skia.org/533814

$ go get go.skia.org/infra@9d8975cd94011aba8e5a03aeaf9b89943d0ae815
$ go get cloud.google.com/go/pubsub@v1.8.3 # needed to fix go.mod error
$ go mod download
$ make -C infra/bots train
$ make -C bazel gazelle_update_repo
$ make -C bazel generate

The last step was just to make sure no current BUILD.bazel
files changed as a result of updating Gazelle (they did not).

I then re-introduced the motivating bug from reviews.skia.org/533804
and noted that make -C bazel generate fixed the erroneous
filename (as expected).

Change-Id: Ie65b88f8285bb8a3edf305dbaa68058335469883
Bug: skia:12541
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/534856
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
4 files changed