The "npm:validate" task validates the repository's `package.json` npm manifest file against its JSON schema to catch any
problems with its data format.

In order to avoid duplication of content, JSON schemas may reference other schemas via the `$ref` keyword. The
`package.json` schema was recently updated to share resources with the "base" configuration schema, which caused the
validation to start failing:

schema /tmp/package-json-schema-norSGPxlCR.json is invalid
error: can't resolve reference https://json.schemastore.org/base.json#/definitions/license from id https://json.schemastore.org/package.json#
task: Failed to run task "npm:validate": exit status 1

The solution is to configure the task to download that schema as well and also to provide its path to the avj-cli
validator via a `-r` flag.

Install referenced schema in "npm:validate" task

A breaking change was made in the 3.2.1 release of the "actions/upload-artifact" action, without doing a major version
bump as would be done in a responsibly maintained project. The action now defaults to not uploading "hidden" files.

This project's "Check npm Dependencies" workflow uses the "Licensed" tool to check for incompatible dependency licenses.
The dependencies license metadata cache used by Licensed is stored in a folder named `.licensed`.

In order to facilitate updates, the workflow uploads the generated dependencies license metadata cache as a workflow
artifact when the current cache is found to be outdated.

The `.` at the start of the `.licensed` folder name causes it to now not be uploaded to the workflow artifact. In order
to catch such problems, the workflow configures the "actions/upload-artifact" action to fail if no files were uploaded.
So in addition to not uploading the artifact, the change in the "actions/upload-artifact" action's behavior also
resulted in the workflow runs failing:

Error: No files were found with the provided path: .licenses/. No artifacts will be uploaded.

The problem is fixed by disabling the "actions/upload-artifact" action's new behavior via the `include-hidden-files`
input. After this change, the workflow can once more upload the dependencies license metadata cache to a workflow
artifact as needed.

Configure actions/upload-artifact action to upload required hidden files