Setup dependabot for dependencies updates

[php-coder]

Also configure it to update actions/setup-node and actions/checkout actions.

actions/setup-node changelogs:

• https://github.com/actions/setup-node/releases/tag/v3.6.0
• https://github.com/actions/setup-node/releases/tag/v3.7.0
• https://github.com/actions/setup-node/releases/tag/v3.8.0
• https://github.com/actions/setup-node/releases/tag/v3.8.1
• https://github.com/actions/setup-node/releases/tag/v3.8.2
• https://github.com/actions/setup-node/releases/tag/v4.0.0
• https://github.com/actions/setup-node/releases/tag/v4.0.1
• https://github.com/actions/setup-node/releases/tag/v4.0.2