MPS: `randn!` produces NaNs

Hi,

On a M2 Max with

```
(code) pkg> st
[e9467ef8] GLMakie v0.10.15
[63c18a36] KernelAbstractions v0.9.29
[dde4c033] Metal v1.4.2
[d96e819e] Parameters v0.12.3
[91a5bcdd] Plots v1.40.8
[92933f4c] ProgressMeter v1.10.2
[295af30f] Revise v3.6.2
[2913bbd2] StatsBase v0.34.3
[9a3f8284] Random
```

I observe:

```julia
using Metal
N = 10_000_000
X0 = MtlArray(zeros(Float32, Int64(N) ));
Metal.randn!(X0)
sum(isnan, X0) # random number, seems always > 0
```

I hope this is not too difficult to fix.

best regards