* ci: use latest Go 1.21 build
Use `1.21.x` instead of `1.21.0` to automatically select the latest.
* fix: remove unused fipsonly package
Remove an unused package that was unintendedly introduced as a conditional dependency of upstream
* update: use boring package not global var
Align with the upstream to use `boring` as a name for a package. No functional changes.
* new: name aliasing
Create u_alias.go to hold any alias names created by version upgrades or other necessary changes (e.g., upstream breaking change) to prevent further breaking the API.
