Release version 12.2.0

Features

• Feature/artpec 9 support by @Corallo in #325

Updates

• Dockerfile multistage build housekeeping by @joakimr-axis in #311
• curl-openssl: Use global device proxy by @isak-jakobsson and @pataxis in #314
• DEV: Add proxy section by @isak-jakobsson in #315
• tensorflow-to-larod*: Update build argument instructions by @isak-jakobsson in #317
• vdo-larod: Fix inaccurate model description by @isak-jakobsson #323

Full Changelog: 12.1.0...12.2.0