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feat: Support Node 18+
chore: Additional Node 18 upgrades
chore: don't change test fixtures
feat: Move kokoro directories to 18
chore: Update checkout and setup-node to v4
https://github.com/actions/checkout/releases/tag/v4.0.0
https://github.com/actions/setup-node/releases/tag/v4.0.0
Source-Link: googleapis/synthtool@c19dd80
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:8060aba1f6d5617d08091767141ab2a99ea1ccbd9371fd42ffc208c5329caa73