Delete vulns/envoy/18431.yaml

[DanDanBro]

vulns/envoy/18431.yaml is an outdated (old format) duplicate (containing less than half of the information) of vulns/envoy/OSV-2019-1.yaml.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[hartwork]

@DanDanBro was there any progress on signing the CLA? Should this be closed?

[DanDanBro]

@hartwork it said for me the CLA signing already succeeded on 11 jan 2024 . All checks also passed. So i dont know what else should be done to get this PR accepted.

[hartwork]

@DanDanBro interesting, I missed that detail, my bad, I was only trying to help.

I now see that the last few pages of commits are all from @osv-robot which sounds non-human. Maybe @jonathanmetzman has ideas about your case or who to talk to? 🙏