chore(deps): update dependency sinon to v12 (#628)
chore(deps): update dependency sinon to v12 (#628)

Co-authored-by: gcf-merge-on-green[bot] <6c7a4de7cdf40496888e303ea3f489f3cc742362@users.noreply.github.com>
Co-authored-by: Benjamin E. Coe <69440dae14aaa9fe2429b324bfce03449d09e1db@google.com>
googleapis/google-cloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node