LazyInitialized is not GC-safe

[maleadt]

Yet another issue caused by finalizers not running on their own thread:

Stacktrace:
  [1] try_yieldto(undo::typeof(Base.ensure_rescheduled))
    @ Base ./task.jl:921
  [2] wait()
    @ Base ./task.jl:995
  [3] yield()
    @ Base ./task.jl:875
  [4] initialize!(x::CUDA.APIUtils.LazyInitialized{Vector{Vector{Union{Nothing, Bool}}}, CUDA.var"#1003#1004"}, constructor::CUDA.var"#1005#1006")
    @ CUDA.APIUtils ~/Julia/pkg/CUDA/lib/utils/threading.jl:57
  [5] get!
    @ CUDA.APIUtils ~/Julia/pkg/CUDA/lib/utils/threading.jl:28 [inlined]
  [6] macro expansion
    @ CUDA ~/Julia/pkg/CUDA/lib/utils/memoization.jl:69 [inlined]
  [7] stream_ordered(dev::CuDevice)
    @ CUDA ~/Julia/pkg/CUDA/src/pool.jl:163
  [8] #_free#1023
    @ ~/Julia/pkg/CUDA/src/pool.jl:510 [inlined]
  [9] _free
    @ ~/Julia/pkg/CUDA/src/pool.jl:503 [inlined]
 [10] macro expansion
    @ ~/Julia/pkg/CUDA/src/pool.jl:488 [inlined]
 [11] macro expansion
    @ ./timing.jl:395 [inlined]
 [12] #free#1022
    @ ~/Julia/pkg/CUDA/src/pool.jl:487 [inlined]
 [13] free
    @ ~/Julia/pkg/CUDA/src/pool.jl:476 [inlined]
 [14] (::CUDA.var"#1029#1030"{CUDA.Mem.DeviceBuffer, Bool})()
    @ CUDA ~/Julia/pkg/CUDA/src/array.jl:101
 [15] #context!#912
    @ ~/Julia/pkg/CUDA/lib/cudadrv/state.jl:170 [inlined]
 [16] context!(ctx::CuContext)
    @ CUDA ~/Julia/pkg/CUDA/lib/cudadrv/state.jl:165 [inlined]
 [17] _free_buffer(buf::CUDA.Mem.DeviceBuffer, early::Bool)
    @ CUDA ~/Julia/pkg/CUDA/src/array.jl:89
 [18] release(rc::GPUArrays.RefCounted{CUDA.Mem.DeviceBuffer}, args::Bool)
    @ GPUArrays ~/.julia/packages/GPUArrays/EoKy0/src/host/abstractarray.jl:42
 [19] unsafe_free!
    @ GPUArrays ~/.julia/packages/GPUArrays/EoKy0/src/host/abstractarray.jl:90 [inlined]
 [20] unsafe_finalize!(xs::CuArray{Float16, 2, CUDA.Mem.DeviceBuffer})
    @ CUDA ~/Julia/pkg/CUDA/src/array.jl:113