Use norm instead of opnorm

Author: OlivierHnt

ext/IntervalArithmeticLinearAlgebraExt.jl

@@ -126,7 +126,7 @@ function Base.inv(A::Matrix{<:RealOrComplexI})
     mid_A = mid.(A)
     approx_A⁻¹ = interval(inv(mid_A))
     F = A * approx_A⁻¹ - interval(LinearAlgebra.I)
-    Y = LinearAlgebra.opnorm(approx_A⁻¹ * F, Inf)
+    Y = LinearAlgebra.norm(approx_A⁻¹ * F, Inf)
     Z₁ = LinearAlgebra.opnorm(F, Inf)
     if isbounded(Y) & strictprecedes(Z₁, one(Z₁))
         A⁻¹ = interval.(approx_A⁻¹, inf(interval(mag(Y)) / (one(Z₁) - interval(mag(Z₁)))); format = :midpoint)