Add pathfinder support for cupti64_2026.2.1.dll (released with CTK 13.3.1) (#2276)

* Add cupti64_2026.2.1.dll in pathfinder/_dynamic_libs/descriptor_catalog.py (to support CTK 13.3.1)

* Add cuda_pathfinder 1.5.6-notes.rst

* Add PR URL in 1.5.6-notes.rst

* Replace dummy PR number with 2276 (1.5.6-notes.rst)

Author: rwgk

cuda_pathfinder/cuda/pathfinder/_dynamic_libs/descriptor_catalog.py

@@ -272,6 +272,7 @@ class DescriptorSpec:
         linux_sonames=("libcupti.so.12", "libcupti.so.13"),
         windows_dlls=(
             "cupti64_2026.3.0.dll",
+            "cupti64_2026.2.1.dll",
             "cupti64_2026.2.0.dll",
             "cupti64_2026.1.1.dll",
             "cupti64_2026.1.0.dll",

cuda_pathfinder/docs/nv-versions.json

@@ -3,6 +3,10 @@
         "version": "latest",
         "url": "https://nvidia.github.io/cuda-python/cuda-pathfinder/latest/"
     },
+    {
+        "version": "1.5.6",
+        "url": "https://nvidia.github.io/cuda-python/cuda-pathfinder/1.5.6/"
+    },
     {
         "version": "1.5.5",
         "url": "https://nvidia.github.io/cuda-python/cuda-pathfinder/1.5.5/"

cuda_pathfinder/docs/source/release/1.5.6-notes.rst

@@ -0,0 +1,15 @@
+.. SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+.. SPDX-License-Identifier: Apache-2.0
+
+.. py:currentmodule:: cuda.pathfinder
+
+``cuda-pathfinder`` 1.5.6 Release notes
+=======================================
+
+Highlights
+----------
+
+* Add support for the Windows CTK 13.3.1 CUPTI DLL name
+  ``cupti64_2026.2.1.dll`` so ``load_nvidia_dynamic_lib("cupti")`` can
+  recognize the installed library on CTK 13.3.1 systems.
+  (`PR #2276 <https://github.com/NVIDIA/cuda-python/pull/2276>`_)