devel/go-tools: update to 0.49.0
Selected upstream changes:
- present: correct documented time for dates
- present: validate background directive arguments
- cmd/present: fix obsolete flag in security warning
- present, cmd/present, cmd/present2md: document lack of security hardening
- go.mod: update golang.org/x dependencies
Changelog: https://github.com/golang/tools/compare/v0.48.0...v0.49.0