Redundant type parameters in `deref` methods

[wackbyte]

Currently, pipe_deref is defined like so:

fn pipe_deref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> R
where
    Self: Deref<Target = T>,
    T: 'a + ?Sized,
    R: 'a + Sized,
{ ... }

The type parameter T here is redundant as it is essentially an alias for <Self as Deref>::Target.
pipe_deref can be rewritten as:

fn pipe_deref<'a, R>(&'a self, func: impl FnOnce(&'a Self::Target) -> R) -> R
where
    Self: Deref,
    Self::Target: 'a,
    R: 'a + Sized,
{ ... }

(This goes for tap_deref as well as these methods' mutable counterparts.)