Address SNYK warnings

[ryjones]

No description provided.

[swcurran]

@berendsliedrecht — what do you think of the test failures? Are they relevant to the change, or gremlins.

Thanks, @ryjones — I should have done that, and will next time. I just thought there might be some sort of setting that enabled dependabot-type, DCO-loving PRs to be produced from Snyk :-).

[berendsliedrecht]

@swcurran let me have a look. I think we generate some number non-deterministically which made the test fail this one time (assumption based on the error below).

thread 'main' panicked at 'Unable to create or update the revocation state: Error { kind: InvalidState, cause: None, message: Some("Revocation index is outside of valid range") }', src\services\prover.rs:64:49

Will hopefully provide a fix asap.