DEP: Enforce numpy keyword deprecation in read_json

[phofl]

#30636

[WillAyd]

Can you also remove the relevant code from JSONToObj.c?

[WillAyd]

Some pointers that may be helpful:

1. Should be able to remove the dtype struct member:
   

   pandas/pandas/_libs/src/ujson/python/JSONtoObj.c

   Line 54 in 8b503a8

   PyArray_Descr *dtype;

2. Can remove from kwargs:
   

   pandas/pandas/_libs/src/ujson/python/JSONtoObj.c

   Line 497 in 8b503a8

   static char *g_kwlist[] = {"obj", "precise_float", "numpy",

3. Can remove local variable reference:
   

   pandas/pandas/_libs/src/ujson/python/JSONtoObj.c

   Line 508 in 8b503a8

   int numpy = 0, labelled = 0;

And any references of that variable you find

[phofl]

Not sure if I got everything.

I don't think we can remove the dtype, it is also used for dtype inference if nothing is passed

[WillAyd]

Nice cleanup - lgtm after conflict fixup