Fix Lifetime Warnings

[shawntabrizi]

Fix these warnings:

warning: unnecessary lifetime parameter `'a`
  --> primitives/runtime/src/curve.rs:28:28
   |
28 | pub struct PiecewiseLinear<'a> {
   |                            ^^
   |
   = help: you can use the `'static` lifetime directly, in place of `'a`

warning: `sp-runtime` (lib) generated 1 warning
   Compiling frame-support v4.0.0-dev (/Users/shawntabrizi/Documents/GitHub/substrate2/frame/support)
warning: unnecessary lifetime parameter `'a`
   --> frame/support/src/storage/bounded_vec.rs:112:25
    |
112 | pub struct BoundedSlice<'a, T, S>(&'a [T], PhantomData<S>);
    |                         ^^
    |
    = help: you can use the `'static` lifetime directly, in place of `'a`

   Compiling frame-system v4.0.0-dev (/Users/shawntabrizi/Documents/GitHub/substrate2/frame/system)
warning: `frame-support` (lib) generated 1 warning

The second warning about BoundedVec seems we should ignore.

Needs: rust-lang/rust#96956

[KiChjang]

I really don't see why this can be 'static, we should be parameterizing over the lifetime of the reference to the slice, but I don't know why rustc or clippy is telling us to just use 'static.

[shawntabrizi]

yeah, thinking a little more, I think you are right. So then just add a clippy silencer here?

[shawntabrizi]

rust-lang/rust#96956

Seems it is a bug atm (either to silence it or the warning itself)

[ggwpez]

No idea why it started annoying us with this. Does not make sense IMO.
Otherwise it would not work outside of static context anymore

[KiChjang]

Yeah perhaps we silence this lint globally.

[bkchr]

You can not silence it. However, I also don't think this here is the correct solution. This is a bug in rustc and I also already looked into it. It is coming from the scale_info::TypeInfo derive macro. We need to wait for rustc to fix this.