breakage in `zvariant_derive` with `ashpd`

[edwloef]

After the latest patch release, ashpd no longer compiles. Setting zvariant_derive = "=5.5.1" resolves the issue.

Steps to reproduce:

1. cargo init tmp
2. cargo add ashpd
3. cargo check

[zeenix]

Ouch. Thank you for reporting. I was suspecting it might break something. 😞 I also made the mistake of publishing this the last two releases as micro (they should have been minor). 🤦‍♂️

I'm travelling at the moment but I'll have a look into it soon...