devel/go-tools: update to 0.30.0
Selected upstream changes:
- cmd: apply modernizers
- tools: fix typos in docs and comments
- godoc,present,refactor: modernize
- x/tools: use types.VarKind consistently
- go.mod: update golang.org/x dependencies
Changelog: https://github.com/golang/tools/compare/v0.29.0...v0.30.0