ci: fix cargo vet handling of workspace crates

[jdygert-spok]

https://github.com/aranya-project/aranya-core/actions/runs/12719192945/job/35458971350

[gknopf-aranya]

Context from a conversation with @jdygert-spok:

"Should just need to add audit-as-crates-io = true/false, but I think also we want to change them to false.

Should double check what that does and if there's any issue there about what version actually gets audited, but I think false will be more in line with what we want."