Make a new release (0.6.0)

[cgwalters]

Looks like a bunch of changes have landed since the last release.

I happened to glance at the cargo deny scanning from a project and we have duplicate uuid crates due to this repo:

 warning[duplicate]: found 2 duplicate entries for crate 'uuid'
    ┌─ /github/workspace/Cargo.lock:189:1
    │  
189 │ ╭ uuid 0.8.2 registry+https://github.com/rust-lang/crates.io-index
190 │ │ uuid 1.2.2 registry+https://github.com/rust-lang/crates.io-index
    │ ╰────────────────────────────────────────────────────────────────^ lock entries
    │  
    = uuid v0.8.2
      └── libsystemd v0.5.0
          └── ostree-ext v0.10.0
              └── bootc-lib v0.1.0
                  └── bootc v0.1.0
    = uuid v1.2.2
      └── cap-tempfile v1.0.1
          ├── cap-std-ext v1.0.1
          │   ├── bootc-lib v0.1.0
          │   │   └── bootc v0.1.0
          │   ├── containers-image-proxy v0.5.2
          │   │   └── ostree-ext v0.10.0
          │   │       └── bootc-lib v0.1.0 (*)
          │   └── ostree-ext v0.10.0 (*)
          ├── containers-image-proxy v0.5.2 (*)
          └── ostree-ext v0.10.0 (*)

Looks like this was fixed in.

https://github.com/lucab/libsystemd-rs/commit/e11d3e6b277a4163071f8772499c1e72e67bcd91