[Bug] Node versions are not aligned across Docker and runtime

[kmcginnes]

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Describe the bug

The Node version the project uses is inconsistent. Also, Node v16 is no longer supported.

Node.js Previous Releases

# Dockerfile
Node: v16.20.2

# GitHub checks workflow
Node: v18.16.0

# nvmrc
Node: v16

Expected behavior

All Node versions should be consistent.

Tasks

• [ ] Update Node version in GitHub Actions
• [ ] Update Node version in Dockerfile
• [ ] Update Node version in package.json
• [ ] Update Node version in .nvmrc
• [ ] Add new file .node-version file

[kmcginnes]

Related to #303, #305, #306

[kmcginnes]

Also, GitHub Actions is unhappy about our Node version choices: