Move cuda-pathfinder dependency to core (#835)

Seems like `cuda-pathfinder` is required for both pypi base and system
base ctk installation. It does not bring extra dependencies, so there
should not be any problem.

Currently it is an issue when user installs `numba-cuda` without
subpackages and provides ctk path. They will end up in the env that is
missing (or out dated) required `cuda-pathfinder` package.

Author: ZzEeKkAa

pyproject.toml

@@ -18,13 +18,13 @@ dependencies = [
     "numba>=0.60.0",
     "cuda-bindings>=12.9.1,<14.0.0",
     "cuda-core>=0.5.1,<1.0.0",
+    "cuda-pathfinder>=1.3.4,<2.0.0",
     "packaging",
 ]
 
 [project.optional-dependencies]
 cu12 = [
     "cuda-bindings>=12.9.1,<13.0.0",
-    "cuda-pathfinder>=1.3.4,<2.0.0",
     # install nvcc for libNVVM
     "cuda-toolkit[cudart,nvcc,nvrtc,cccl]==12.*",
 
@@ -42,7 +42,6 @@ cu12 = [
 ]
 cu13 = [
     "cuda-bindings==13.*",
-    "cuda-pathfinder>=1.3.4,<2.0.0",
     "cuda-toolkit[cudart,nvvm,nvrtc,cccl]==13.*",
 
     # It is okay to be out of sync with cuda-toolkit here, as long as the