ci: Bump to v4 versions of GitHub actions

[DannyvdSluijs]

In the actions run of jsonschema several warning are raised during the runs, this PR updates the GitHub Actions versions used to version 4 to resolve the warnings.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.Show more

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Can be seen on https://github.com/jsonrainbow/json-schema/actions/runs/9169858668