Update cid version to v0.11.1 and multihash to v0.19.3

[afbase]

relates to #197

[afbase]

I think we're very close. I'm not sure how to best go about the lint issue and if maintainers can get this over the hump, that would be greatly appreciated.

[afbase]

cc: @vmx

[afbase]

the main issue is this dependency_on_unit_never_type_fallback.

quote! {
#[allow(dependency_on_unit_never_type_fallback)]
#encode
#[allow(dependency_on_unit_never_type_fallback)]
#decode

I'm not sure how you feel about it but the idea above I think would pass all tests if we modify dag-cbor-derive/src/lib.rs

[afbase]

see #202

the main issue is this dependency_on_unit_never_type_fallback.

quote! {
#[allow(dependency_on_unit_never_type_fallback)]
#encode
#[allow(dependency_on_unit_never_type_fallback)]
#decode

I'm not sure how you feel about it but the idea above I think would pass all tests if we modify dag-cbor-derive/src/lib.rs