v1.21.2

Added
DAP: add concrete type to interface type (@suzmue, #3510)
Support for VSCode in the edit command (@derekparker, #3524)
Follow-mode support for Windows (@aarzilli, #3507)

Fixed
Fix bugs handling stdout/stderr in DAP (@hyangah, #3522)
Fix bug with autogenerated wrappers for methods of generic types (@aarzilli, #3528)

Changed
Use Cgo instead of C code in the FreeBSD backend (@4a6f656c, #3529)
Remove obsolete build tags (+build) (@alexandear, #3513)