Problem: cargo audit warnings

[tomtau]

Describe the bug
Running cargo audit found three unmaintained dependencies: failure, net2 and serde_cbor.

Running cargo audit found four vulnerable dependencies:

1. RUSTSEC-2021-0119 in nix 0.20.0 – requires upgrade to >=0.23.0
2. RUSTSEC-2022-0013 in regex 1.5.4 – requires upgrade to >=1.5.5
3. RUSTSEC-2020-0071 in time 0.1.43 – requires update to >=0.2.23
4. RUSTSEC-2021-0124 in tokio 0.2.25 – requires upgrade to >=1.13.1

To Reproduce
Steps to reproduce the behavior:

1. Run cargo audit

Expected behavior
No unmaintained dependencies shown.
No vulnerable dependencies shown.

Desktop:

• OS: Ubuntu
• Version 22.04

[tomtau]

note that most of them come from the SGX runner-related dependencies: https://github.com/crypto-com/tmkms-light/blob/main/.github/workflows/tmkms.yml#L55 and would need to be fixed upstream in https://github.com/fortanix/rust-sgx