cmd/govulncheck/integration: address vulndb changes
cmd/govulncheck/integration: address vulndb changes

Change-Id: I9ef2c1b8b7a7970e3e8ac08b4ce4939490828328
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/428040
Reviewed-by: Jonathan Amsterdam <e3d3698b2ccd5955e4adf250d0785062d0f9018b@google.com>
Run-TryBot: Zvonimir Pavlinovic <490af24f3def1258d2f7e9b10b20e341f6c68320@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/vuln,golang/vuln