The clippy used in CI only includes Rust 1.72 lints

[fuzzypixelz]

Describe the release item

More than 60 lints have been added to clippy since Rust 1.72. Many of them are relevant to the project currently (i.e. they throw warnings). They can be accessed by running cargo +stable clippy.

I think it makes sense for us to use Stable Rust lints in the CI. The downside is that someone might forget to add +stable when running clippy locally.

However, even though we use Rust 1.72 currently, dependent crates are free to compile zenoh with any toolchain > MSRV. Thus it makes sense to use Stable Rust lints.