Fix clippy needless_lifetimes lint

[FreezyLemon]

needless_lifetimes seems to have been stabilized in 1.83. It correctly identifies completely unnecessary lifetimes, but also warns on cases like this:

warning: the following explicit lifetimes could be elided: 'a
  --> src/software/scaling/vector.rs:32:6
   |
32 | impl<'a> Vector<'a> {
   |      ^^         ^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
help: elide the lifetimes
   |
32 - impl<'a> Vector<'a> {
32 + impl Vector<'_> {

I don't think this is an improvement, so unless rust-lang/rust-clippy#13514 or something similar is done, I'd just #![allow] it.

[shssoichiro]

I think I'd rather just allow it on a case-by-case basis if we need to. Definitely a matter of opinion though, so let me know how strongly you feel about globally allowing it.

[FreezyLemon]

I'd usually prefer that, too. But seeing the latest CI run with ~100 errors only about this lint, it seems easier to just allow it globally. The worst code smell from this will be an unnecessary lifetime (see first commit in this PR), which I don't see as a big problem.

[shssoichiro]

Oh. That's a bit silly. Yeah, I don't think I care enough about clippy's opinion on this one.