Use workspace lints to control unexpected_cfgs. (#682)

By using `workspace.lints`, we can configure lints once for
everything (and then inherit it into the various crates).

The lint configuration for `unexpected_cfgs` works in 1.80+
and warns otherwise.

Co-authored-by: Thierry Berger <contact@thierryberger.com>

src/lib.rs

@@ -15,7 +15,6 @@
 #![allow(clippy::too_many_arguments)]
 #![allow(clippy::needless_range_loop)] // TODO: remove this? I find that in the math code using indices adds clarity.
 #![allow(clippy::module_inception)]
-#![allow(unexpected_cfgs)] // This happens due to the dim2/dim3/f32/f64 cfg.
 
 #[cfg(all(feature = "dim2", feature = "f32"))]
 pub extern crate parry2d as parry;