VecView: Implement serialize

[sosthene-nitrokey]

I kept the initial implementation on Vec, but is there any reason why it doesn't use the implementation of Serialize for [T]?

[sosthene-nitrokey]

This probably does not need a changelog entry since VecView has not yet been released.

[sosthene-nitrokey]

The error seems to be caused by the Rust 1.76 release changing the error message. Maybe the Rust version should be pinned for CI.

[Dirbaio]

done in #486 1a08c7ac27634e5d405acaa2f35bd31e746c96da