fix typo in Float32 number generation

introduced in #56144

Author: KristofferC

stdlib/Random/src/XoshiroSimd.jl

@@ -46,7 +46,7 @@ simdThreshold(::Type{Bool}) = 640
     ui = (x>>>32) % UInt32
     li = x % UInt32
     u = _uint2float(ui, Float32)
-    l = _uint2float(ui, Float32)
+    l = _uint2float(li, Float32)
     (UInt64(reinterpret(UInt32, u)) << 32) | UInt64(reinterpret(UInt32, l))
 end
 @inline function _bits2float(x::UInt64, ::Type{Float16})

stdlib/Random/test/runtests.jl

@@ -1250,6 +1250,12 @@ end
     @test length(xs) == 3
 end
 
+@testset "float32 bug" begin
+    a = rand(Float32, 4)
+    @test a[1] != a[2]
+    @test a[3] != a[4]
+end
+
 @testset "Docstrings" begin
     @test isempty(Docs.undocumented_names(Random))
 end