atsamd-rs:owners should own crates published by atsamd-bot

[sajattack]

@TDHolmes noticed that some of the crates recently published through github actions were owned by only atsamd-bot, and not atsamd-rs:owners. We should update the github action script (atsamd/.github/workflows/release-crates.yml) to include a command such as cargo owner add github:atsamd-rs:owners (not sure if this is the exact syntax, please double check)