Packaging zenoh-util fails

[fuzzypixelz]

Describe the release item

Trying to publish all crates in the workspace to a Cargo registry fails with the following:

$ cargo publish --manifest-path commons/zenoh-util/Cargo.toml
error: failed to verify package tarball

Caused by:
  package `clap_derive v4.5.0` cannot be built because it requires rustc 1.74 or newer, 
  while the currently active rustc version is 1.72.0

This is essentially the same issue in #740. However, zenoh-util needlessly depends on clap. And so does zenoh-plugin-rest, zenoh-plugin-sotrage-manager and zenoh-ext.

However, zenohd depends on clap which would've necessitated updating the toolchain if it weren't for the fact that Cargo publishes the lockfiles of crates that contain binary targets.

So technically, we need only remove unused clap dependencies in this case.