v1.9.0

What's Changed

• adds link to tools / tcp-client by @amanjeev in #59
• Adjust wording for the self-test. by @jonathanpallant in #60
• Hide rustlatin warnings. by @jonathanpallant in #68
• Update github actions to node.js 20 versions by @jonathanpallant in #69
• Update nrf52 exercises by @jonathanpallant in #66
• Add Puzzle FW by @jonathanpallant in #67
• Updates as I run through by @jonathanpallant in #70

Full Changelog: v1.8.0...v1.9.0