chore: store artifacts in placer (#508)

Source-Link: https://github.com/googleapis/synthtool/commit/cb960373d12d20f8dc38beee2bf884d49627165e
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:2d816f26f728ac8b24248741e7d4c461c09764ef9f7be3684d557c9632e46dbd

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
2 files changed