CI tests fail with older Node.js versions

[MikeMcC399]

Issue

CI test workflows are failing on older Node.js versions <= 14:

Workflow	Fails for Node.js
.github/workflows/test-macos.yml	<= 14
.github/workflows/test-ubuntu.yml	<= 6
.github/workflows/test-windows.yml	= 6

macos-latest

The workflow .github/workflows/test-macos.yml fails when attempting to set up Node.js 4, 6, 8, 10, 12 and 14 with the error

Unable to find Node version 'xx' for platform darwin and architecture arm64.

GitHub Actions' macos-latest is currently equivalent to macos-14 which is an arm64 image. Node.js v16.0.0 was the first release to ship prebuilt binaries for Apple Silicon i.e. arm64.

ubuntu-latest

The workflow .github/workflows/test-ubuntu.yml fails when attempting to execute npm install under Node.js 4 and 6.

windows-latest

The workflow .github/workflows/test-windows.yml fails when attempting to execute npm install under Node.js 6.

[MikeMcC399]

Closing due to lack of response to PR #25