Add pathfinder support for cupti64_2026.3.1.dll (CTK 13.4.1)

The nvidia-cu13 wheel now ships cupti64_2026.3.1.dll, which was not
listed in the cupti descriptor's windows_dlls, causing
test_load_nvidia_dynamic_lib[cupti] to fail under all_must_work.

Author: juenglin

cuda_pathfinder/cuda/pathfinder/_dynamic_libs/descriptor_catalog.py

@@ -362,6 +362,7 @@ class DescriptorSpec:
         packaged_with="ctk",
         linux_sonames=("libcupti.so.13", "libcupti.so.12"),
         windows_dlls=(
+            "cupti64_2026.3.1.dll",
             "cupti64_2026.3.0.dll",
             "cupti64_2026.2.1.dll",
             "cupti64_2026.2.0.dll",