Revert to old rng in RQSCouplingBlock init

Author: Micki-D

src/rqspline_coupling.jl

@@ -112,8 +112,8 @@ Construct and instance of `RQSplineCouplingBlock`, while initializing the parame
 compute device specified in `compute_unit`. (Defaults to CPU)
 """
 function RQSplineCouplingBlock(mask::Vector{Bool}, nn::Chain, compute_unit::AbstractComputeUnit=CPUnit())
-    # Set fixed rng to be consistent across julia versions, alternative: rng = Random.default_rng(); Random.seed!(rng,0)
-    rng = MersenneTwister(1234)
+    rng = Random.default_rng()
+    Random.seed!(rng, 0)
 
     lux_compute_unit = compute_unit isa CPUnit ? cpu_device() : gpu_device()