cmd/govulncheck: get module versions from vulncheck Result
cmd/govulncheck: get module versions from vulncheck Result

Obtain the current version of each vulnerable module
from the RequireGraph returned by vulncheck.

Change-Id: Ib2991e207296c2651ce2da64e7cf1ff11afbcc75
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/400015
Run-TryBot: Jonathan Amsterdam <e3d3698b2ccd5955e4adf250d0785062d0f9018b@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Zvonimir Pavlinovic <490af24f3def1258d2f7e9b10b20e341f6c68320@google.com>

golang/vuln,golang/vuln