ci: update lint workflow action versions

[MikeMcC399]

Issue

The GitHub Actions workflow .github/workflows/lint.yml is using outdated JavaScript actions.

Action	Used	Supported
actions/checkout	v2	v4
actions/setup-node	v1	v4

These actions attempt to run on node12 (end-of-life Apr 2022) and are forcefully migrated on the fly to use instead the supported node20 version.

Since there is no selection of a Node.js version in the use of actions/setup-node, it is installing Node.js v10.24.1 (end-of-life Apr 2021). This is in contrast to the default Node.js version of ubuntu-22.04 v18.20.5 or ubuntu-24.04 v20.18.1. The workflow uses ubuntu-latest which is currently in the process of migrating from ubuntu-22.04 to ubuntu-24.04.

Change

Update the action versions to the currently supported versions, and use Node.js Active LTS - at this time v22 - as most stable recommended version.

Action	Supported	Parameter
actions/checkout	v4	N/A
actions/setup-node	v4	node-version: 22

[MikeMcC399]

Closing this PR as I subsequently realized:

• the linting module xo (JavaScript/TypeScript linter (ESLint wrapper) with great defaults) is configured using xo@0.20.3. This causes the deprecation warning:

  npm warn deprecated eslint@4.19.1: This version is no longer supported. Please see https://eslint.org/version-support for other options.

  ESLint Version Support shows that ESLint 4.x entered end-of-life on Dec 22, 2018.

• attempting to update xo to newer versions, causes linting errors, including code which needs a higher min engines version, such as Node.js >=4.0.0 or >=7.6.0. Significant other coding changes would need to be made as well.

This PR could be readdressed after min engines is addressed and xo is updated.