Avoid type promotions due to hard-coded tolerances

...in the `AlefieldPotraShi` solver.

src/Bracketing/alefeld_potra_shi.jl

@@ -92,7 +92,7 @@ function update_state(
     options,
     l=NullTracks(),
 ) where {T,S}
-    μ, λ = 0.5, 0.7
+    μ, λ = T(0.5), T(0.7)
     atol, rtol = options.xabstol, options.xreltol
     tols = (; λ=λ, atol=atol, rtol=rtol)
 
@@ -187,7 +187,7 @@ struct A2425{K} <: AbstractAlefeldPotraShi end
 function calculateΔ(::A2425{K}, F::Callable_Function, c₀::T, ps) where {K,T}
     a, b, d, ee = ps.a, ps.b, ps.d, ps.ee
     fa, fb, fd, fee = ps.fa, ps.fb, ps.fd, ps.fee
-    tols = (λ=0.7, atol=ps.atol, rtol=ps.rtol)
+    tols = (λ=T(0.7), atol=ps.atol, rtol=ps.rtol)
 
     c = a
     for k in 1:K
@@ -236,7 +236,7 @@ fncalls_per_step(::A57{K}) where {K} = K - 1
 function calculateΔ(::A57{K}, F::Callable_Function, c₀::T, ps) where {K,T}
     a, b, d, ee = ps.a, ps.b, ps.d, ps.ee
     fa, fb, fd, fee = ps.fa, ps.fb, ps.fd, ps.fee
-    tols = (λ=0.7, atol=ps.atol, rtol=ps.rtol)
+    tols = (λ=T(0.7), atol=ps.atol, rtol=ps.rtol)
     c, fc = a, fa
 
     for k in 1:K