build(deps): updates all node versions in workflows and package.json to v18

[nickfloyd]

While this change is not technically required as part of our efforts to drop support for NodeJS v14, v16 - this does help to get all of our packages and tooling in sync with a consistent node version.

Part of: octokit/octokit.js#2486

---

Behavior

Before the change?

• We were using node v16 in our test workflow
• We are using node >= 16 in our package.json
• The package-lock.json is currently at version 2

After the change?

• We are now using node v18 in our test workflow
• We are now using node >= 18 in our package.json
• The package-lock.json is now at version 3

[octokitbot]

🎉 This PR is included in version 12.1.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot 📦🚀