Upgrade jsonschema dependency and schema versions

[bjester]

Overview

Currently, le-utils does not directly require jsonschema directly, but does provide code to use schemas in the Kolibri ecosystem. The current JSON schemas are limited to Draft-07 because the latest version of jsonschema to support Python 3.6 only supports up to that draft. The le-utils project must continue to support Python 3.6 until it is deprecated in Kolibri. Once that happens, we can upgrade jsonschema (used in tests) and update the existing schemas to user a newer schema version, 2019 or 2020.

Prerequisite

• le-utils drops support for Python 3.6

Description and outcomes

• Update the jsonschema version to the latest release that aligns with le-utils python version requirements
• Update all JSON schemas to reference a newer schema version
• Ensure the updated schemas still validate
• Replace any UUID regexes with "format": "uuid" (added in 2019-09)