fix multi-version ecosystem security vulnerability failure #9434
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For package managers like NPM where a dependency can have multiple versions, we can get a security job that says update a vulnerable dependency but then Dependabot finds the non-vulnerable version and thinks no update is needed.
To fix this I added code at the start of the security update job to search all of the known versions for a vulnerable one so that the update is successful.
To test this I added multi-version functionality to the fake Silent ecosystem.