devel/go-tools: update to 0.9.1

Selected upstream changes:

 - bisect, cmd/bisect: add new library and tool
 - internal/imports: sort fixes for deterministic results
 - go/callgraph/vta: allow pointer to type parameter in sliceArrayElem
 - go.mod: update golang.org/x dependencies
 - bisect: diagnose bad targets better
 - cmd/bisect: add -compile and -godebug shorthands

Changelog: https://github.com/golang/tools/compare/v0.8.0...v0.9.1