Fix AbstractQ conversion to different-typed matrix (#32979)

Author: mfherbst

stdlib/LinearAlgebra/src/qr.jl

@@ -502,7 +502,7 @@ AbstractMatrix{T}(Q::QRPackedQ) where {T} = QRPackedQ{T}(Q)
 QRCompactWYQ{S}(Q::QRCompactWYQ) where {S} = QRCompactWYQ(convert(AbstractMatrix{S}, Q.factors), convert(AbstractMatrix{S}, Q.T))
 AbstractMatrix{S}(Q::QRCompactWYQ{S}) where {S} = Q
 AbstractMatrix{S}(Q::QRCompactWYQ) where {S} = QRCompactWYQ{S}(Q)
-Matrix{T}(Q::AbstractQ) where {T} = lmul!(Q, Matrix{T}(I, size(Q, 1), min(size(Q.factors)...)))
+Matrix{T}(Q::AbstractQ{S}) where {T,S} = Matrix{T}(lmul!(Q, Matrix{S}(I, size(Q, 1), min(size(Q.factors)...))))
 Matrix(Q::AbstractQ{T}) where {T} = Matrix{T}(Q)
 Array{T}(Q::AbstractQ) where {T} = Matrix{T}(Q)
 Array(Q::AbstractQ) = Matrix(Q)