Bump netlink-packet-utils to v0.6.0

[qmonnet]

Bump netlink-packet-utils version to v0.6.0. No functional change.

The motivation is to eventually get rid of older dependencies: duplicated versions of thiserror and unmaintained crate paste (see rust-netlink/netlink-packet-utils#20 (comment) for more context).

The commit bumps the version for netlink-packet-utils, and adjusts error handling accordingly. Note that I'm not 100% sure I handled the errors correctly (at least it builds and tests still pass), so let me know if there are some more adjustments required.

Note: I thought of creating a version bump commit in the same PR, but I see this one needs to go first if we want the right commit SHA in the changelog.

[cathay4t]

Let's only bump version on release commit.

CI is not happy.

[cathay4t]

Please fix the CI failure

[qmonnet]

My bad - formatting should be fixed, now.

[cathay4t]

The CI failure is caused by rate limit of codecov which is safe to ignore. Force merging.

[cathay4t]

@qmonnet Thanks for the contribution! Could you also fix netlink-packet-core?

[qmonnet]

Yes! Coming next, today or tomorrow.

[qmonnet]

Thinking about this:

Thanks for the contribution! Could you also fix netlink-packet-core?

I suppose you meant netlink-packet-route right? (That's how I understood it the first time, at least).

Before I update netlink-packet-route, could we do a release on netlink-packet-core, so that I can bump both netlink-packet-core and netlink-packet-utils in netlink-packet-route, without having to pull two different versions of nelink-packet-utils as dependencies (one as a direct dep, the other as a dep for -core)?