Initialize the VEX feed

[ricardoapl]

What this PR does / why we need it:

Initialize the VEX feed

VEX can be thought of as a "negative security advisory". Using VEX, software authors can communicate to their users that an otherwise vulnerable component has no security implications for their product.

Quote from https://github.com/openvex/vexctl

Which issue(s) this PR fixes:

Relates to #1437

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ricardoapl
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[dgrisonnet]

/assign
/triage accepted

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle rotten