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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@types/node](https://togithub.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/node) ([source](https://togithub.com/DefinitelyTyped/DefinitelyTyped)) | [`^16.0.0` -> `^18.0.0`](https://renovatebot.com/diffs/npm/@types%2fnode/16.18.3/18.11.9) | [![age](https://badges.renovateapi.com/packages/npm/@types%2fnode/18.11.9/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/@types%2fnode/18.11.9/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/@types%2fnode/18.11.9/compatibility-slim/16.18.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/@types%2fnode/18.11.9/confidence-slim/16.18.3)](https://docs.renovatebot.com/merge-confidence/) |

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…will be rotated (#762)

* build: have Kokoro grab service account credentials from secret that will be rotated

Source-Link: https://togithub.com/googleapis/synthtool/commit/4a0230eb8dc497f36fd3839e6144982131f30a9d
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:f59941869d508c6825deeffce180579545fd528f359f549a80a18ec0458d7094

…will be rotated for system tests (#763)

Source-Link: https://togithub.com/googleapis/synthtool/commit/abbc97db69a57dcb991ba97ef503305b701ffb3a
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:fe04ae044dadf5ad88d979dbcc85e0e99372fb5d6316790341e6aca5e4e3fbc8

Source-Link: googleapis/synthtool@3602660
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:e6d785d6de3cab027f6213d95ccedab4cab3811b0d3172b78db2216faa182e32

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

* build: pin @types/node

Co-authored-by: sofisl <55454395+sofisl@users.noreply.github.com>

Source-Link: googleapis/synthtool@b1ced7d
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:0527a86c10b67742c409dc726ba9a31ec4e69b0006e3d7a49b0e6686c59cdaa9

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

* docs: fix node release schedule link

Co-authored-by: Jeffrey Rennie <rennie@google.com>

Source-Link: googleapis/synthtool@1a24315
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:e08f9a3757808cdaf7a377e962308c65c4d7eff12db206d4fae702dd50d43430


* 🦉 Updates from OwlBot post-processor

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---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Sofia Leon <sofialeon@google.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>