devel/go-tools: update to 0.9.2

Selected upstream changes:

• cmd/bisect, internal/bisect: use more precise skip suffixes, written in hex
• go/gcexportdata: drop support for the ancient (pre go1.11) binary format
• cmd/{guru,callgraph}: stop using go/pointer

Changelog: https://github.com/golang/tools/compare/v0.9.1...v0.9.2