cuda: update CHANGELOG wrt new setpts API

CHANGELOG

@@ -15,6 +15,13 @@ If not stated, FINUFFT is assumed (cuFINUFFT <=1.3 is listed separately).
 * MAX_NF increased from 1e11 to 1e12, since machines grow.
 * improved GPU python docs: migration guide; usage from cupy, numba, torch,
   pycuda. PyPI pkg still at 2.2.0beta.
+* cuFINUFFT interface update: number of nonuniform points M is now a 64-bit integer
+as opposed to 32-bit. While this does modify the ABI, most code will just need to
+recompile against the new library as compilers will silently upcast any 32-bit
+integers to 64-bit when calling cufinufft(f)_setpts. Note that internally, 32-bit
+integers are still used, so calling cufinufft with more than 2e9 points will fail.
+This restriction may be listed in the future.
+
 
 V 2.2.0 (12/12/23)