CI workflows using removed npm install options

[MikeMcC399]

Issue

The following CI workflows are using npm install options which do not work on Node.js >= 16 (npm >= 8):

• .github/workflows/test-macos.yml
• .github/workflows/test-ubuntu.yml
• .github/workflows/test-windows.yml
• .github/workflows/lint.yml

The lowest supported Node.js version is v18.0.0, which bundles npm v8.6.0.

only=prod

Run npm install --only=prod
npm warn config only Use `--omit=dev` to omit dev dependencies from the install.

only=dev

Run npm install --only=dev
npm WARN invalid config only="dev" set in command line options
npm WARN invalid config Must be one of: null, prod, production

Since the repo contains no production dependencies to install, only devDependencies, logging the installation of the two types of dependencies separately seems to be overkill. (See package.json.)

Reference

https://docs.npmjs.com/cli/v6/commands/npm-install

The --only={prod[uction]|dev[elopment]} argument will cause either only devDependencies or only non-devDependencies to be installed regardless of the NODE_ENV.

https://docs.npmjs.com/cli/v10/using-npm/config#include

Default:
Type: "prod", "dev", "optional", or "peer" (can be set multiple times)

https://docs.npmjs.com/cli/v10/using-npm/config#omit

Default: 'dev' if the NODE_ENV environment variable is set to 'production', otherwise empty.
Type: "dev", "optional", or "peer" (can be set multiple times)