serde_cbor and atty no longer maintained

[sam0x17]

Worth noting that serde_cbor and atty are both no longer maintained (specifically abandoned by owner) and are part of the (rust) dependency tree for this project. Ran into this when running cargo audit.

right now I ignore this in my own CI with:

# .cargo/audit.toml
[advisories]
ignore = [
	"RUSTSEC-2021-0127",
	"RUSTSEC-2021-0145",
]