Make type stable verbosity access

[ChrisRackauckas]

Fixes #807 (comment)

@jClugstor please take care with these kinds of issues in the future.

[github-actions]

[JuliaFormatter] _{reported by reviewdog 🐶}

Suggested change

	mutable struct LinearCache{TA, Tb, Tu, Tp, Talg, Tc, Tl, Tr, Ttol, issq, S, V <: LinearVerbosity}
	mutable struct LinearCache{
	TA, Tb, Tu, Tp, Talg, Tc, Tl, Tr, Ttol, issq, S, V <: LinearVerbosity}

[RomeoV]

This is missing the fix in

LinearSolve.jl/src/common.jl

Lines 387 to 391 in d66a3cd

	cache = LinearCache{typeof(A), typeof(b), typeof(u0_), typeof(p), typeof(alg), Tc,
	typeof(Pl), typeof(Pr), typeof(reltol), typeof(assumptions.issq),
	typeof(sensealg)}(
	A, b, u0_, p, alg, cacheval, isfresh, precsisfresh, Pl, Pr, abstol, reltol,
	maxiters, verbose_spec, assumptions, sensealg)

(see my PR, which either superseedes this one or can be closed when this has landed).