Remove improper use of unsafe_pure

Author: helgee

stdlib/LinearAlgebra/src/deprecated.jl

@@ -413,7 +413,7 @@ _RowVector_depstring() = string("`ConjRowVector` and `RowVector` have been depre
         "of the associated changes.")
 
 @inline check_types(::Type{T1}, ::AbstractVector{T2}) where {T1,T2} = check_types(T1, T2)
-@unsafe_pure check_types(::Type{T1}, ::Type{T2}) where {T1,T2} = T1 === transpose_type(T2) ? nothing :
+check_types(::Type{T1}, ::Type{T2}) where {T1,T2} = T1 === transpose_type(T2) ? nothing :
     error("Element type mismatch. Tried to create a `RowVector{$T1}` from an `AbstractVector{$T2}`")
 
 # The element type may be transformed as transpose is recursive