Sourced from github.com/u-root/u-root's releases.

Updates for Tamago (bare metal) and converting commands to packages

There are a lot of changes here, the two most significant being better support for Tamago and the "packagization" of many commands so that other projects (e.g. charmbracelet) can more easily integrate our code.

• b6c6143 Remove all references to removed Baseboard Info table
• 58474a9 cleanup: pkg/grub: remove pflag
• e12143c exp/tfpt: fix spelling in test
• ec1a824 cleanup: remove shell-script-based tftp test
• b072edc cleanup: exp/tftp: remove pflag package
• 1a68779 cleanup: remove pflag usage from cmd/flash
• 5e77210 feat(base64): refactor base64 core util to use the new api design
• e7ba481 refactor(shasum): remove unused parameter
• 44519d5 feat(shasum): refactor shasum core util to use the new api design
• b28627b feat(gzip): refactor gzip core util to use the new api design
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