Sync vendor directory (#2028)

**What type of PR is this?**

> Bug fix

**What package or component does this PR mostly affect?**

> vendor

**What does this PR do? Why is it needed?**

I keep getting editor errors that the vendor directory is out of sync
with go.mod. This PR should fix that.

    go mod vendor
    find vendor -name BUILD.bazel -delete

**Which issues(s) does this PR fix?**

n/a

**Other notes for review**

Author: jayconrod