internal/goversion: increment Version at start of cycle

[dmitshur]

goversion.Version needs to be incremented by one at the start of each development cycle, to match the upcoming major Go release version.

Once done, this issue should be moved to the next major release milestone.

(CC @golang/release.)

[gopherbot]

Change https://golang.org/cl/248038 mentions this issue: internal/goversion: update Version to 1.16

[dmitshur]

CL 248038 took care of this for the Go 1.16 cycle, so moving this issue to be looked at at the start of the Go 1.17 cycle.

[gopherbot]

Change https://golang.org/cl/275297 mentions this issue: internal/goversion: update Version to 1.17