tail: Cargo.toml: Remove unneeded features of uucore and the nix dependency

[Joining7943]

This pr removes the unused features ringbuffer and lines of the uucore dependency. The nix dependency wasn't in use either, so it's removed, too.

[sylvestre]

cool
how did you notice that?

[Joining7943]

I had to adjust the Cargo.toml file in a pr because of the change to workspace.dependencies and then I noticed the unused dependencies. It's a little bit my fault too because I removed the need for these dependencies in some pr before, but didn't notice they're not in use elsewhere.

[tertsdiepraam]

Hmm too bad cargo udeps doesn't flag this. I wonder if we can run it per util too and get a warning automatically.

Edit: udeps doesn't consider it "unused" because it's used via uucore. It does give this warning when I run it from the tail directory though:

unused dependencies:
`uucore v0.0.17 (/home/terts/Programming/uutils/coreutils/src/uucore)`
└─── dependencies
     └─── "dunce"

So running it per util could still be useful.

[Joining7943]

So running it per util could still be useful.

yeah I think too this would be great. In another issue/pr?

[tertsdiepraam]

Yes!