tooling: snyk: install gpgv explicitly

[stlaz]

gnupg only appears to recommend gpgv, but won't install it automatically.

https://testgrid.k8s.io/sig-security-snyk-scan#ci-kubernetes-snyk-master appears to be permafailing for a while because of this missing dependency.

[stlaz]

/test ci-kubernetes-snyk-master

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[PushkarJ]

/lgtm
/cc @ericsmalling @mtardy

[mtardy]

Makes sense given recent failures! Thanks!

/approve

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[PushkarJ]

Thank you @stlaz the tests are green now: https://prow.k8s.io/view/gs/kubernetes-ci-logs/logs/ci-kubernetes-snyk-master/2083221019673235456