Money-to-prisoners-common

Includes updated GOV.UK Design System

- Node.js `16`: https://github.com/ministryofjustice/money-to-prisoners-common/pull/425
- Bumped `cryptography` to fix security vulnerability: https://github.com/ministryofjustice/money-to-prisoners-common/pull/426

Only support Python 3.8+

As part of the migration to a newer version of Ubuntu (`20.04`) which
comes with Python 3.8

Related to ticket: https://dsdmoj.atlassian.net/browse/MTP-1841

Contains:
• fix to ELK log formatting

Contains:
• rejection reason category definitions for security checks
• logging and error handling to allow Sentry.io to group messages better
• updated dependencies
• docker-compose notes

- https://github.com/ministryofjustice/money-to-prisoners-common/pull/415 Bumped transifex-client to work on Python 3.9 (locally)
- https://github.com/ministryofjustice/money-to-prisoners-common/pull/416 docker-compose: Ability to debug/attach to running containers