Fix compile warnings with Rust 1.51 about gitoxide

[edward-shen]

git-config should be clean now.

[edward-shen]

Wow, Rust 1.51 was released less than two hours ago! I see I'm not the only one excited to play with const generics.

I can take a look at my code later this week (probably tomorrow or Saturday) but feel free to fix them if you'd rather do so yourself and/or prefer them to be fixed sooner.

For the most part the usage of unwrap is generally in situations where I reasoned that it was impossible to reach that situation, so I think fixing most parts should be relatively straightforward.

[Byron]

😅 That was mere chance, but it's always nice to install a new Rust version and fix the additional clippy lints that usually pop up, making everything just a little better.

Even though I really want to take a closer look at git-config, I probably won't make it in time. So no rush for you, it's likely these will still be there when you get to it.

On another note, I hope you are also a little bit excited about the grant opportunity 🎉.

[Byron]

Note to self: Add resolver = "2" and fix all the new warnings that show up with it. I think dua-cli might also benefit from it.

[Byron]

Everything I could find is now fixed as well. Please note that resolver = "2" will be activated a bit later once GitHub CI provides the latest Rust binaries - otherwise cargo fmt will fail, unfortunately, claiming that resolver is a nightly flag. Fair enough :D.