bring back cu126 support

[lanluo-nvidia]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please delete options that are not relevant and/or add your own.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[github-actions]

There are some changes that do not conform to Python style guidelines:

--- /home/runner/work/TensorRT/TensorRT/.github/scripts/generate-release-matrix.py	2026-08-28 04:39:41.549086+00:00
+++ /home/runner/work/TensorRT/TensorRT/.github/scripts/generate-release-matrix.py	2026-08-28 04:40:08.128190+00:00
@@ -49,14 +49,14 @@
    includes = matrix_dict["include"]
    filtered_includes = []
    for item in includes:
        # CUDA 12.6 release artifacts are available only for x86_64. This
        # excludes both Linux AArch64 and Windows Arm/AArch64 matrix entries.
-        if (
-            item["desired_cuda"] == "cu126"
-            and item["gpu_arch_type"] in {"cuda-aarch64", "cuda-arm64"}
-        ):
+        if item["desired_cuda"] == "cu126" and item["gpu_arch_type"] in {
+            "cuda-aarch64",
+            "cuda-arm64",
+        }:
            continue
        if (
            item["desired_cuda"] in cuda_versions
            and item["python_version"] in python_versions
        ):

[github-actions]

There are some changes that do not conform to Python style guidelines:

--- /home/runner/work/TensorRT/TensorRT/.github/scripts/generate-release-matrix.py	2026-08-28 04:40:02.723217+00:00
+++ /home/runner/work/TensorRT/TensorRT/.github/scripts/generate-release-matrix.py	2026-08-28 04:40:25.692220+00:00
@@ -49,14 +49,14 @@
    includes = matrix_dict["include"]
    filtered_includes = []
    for item in includes:
        # CUDA 12.6 release artifacts are available only for x86_64. This
        # excludes both Linux AArch64 and Windows Arm/AArch64 matrix entries.
-        if (
-            item["desired_cuda"] == "cu126"
-            and item["gpu_arch_type"] in {"cuda-aarch64", "cuda-arm64"}
-        ):
+        if item["desired_cuda"] == "cu126" and item["gpu_arch_type"] in {
+            "cuda-aarch64",
+            "cuda-arm64",
+        }:
            continue
        if (
            item["desired_cuda"] in cuda_versions
            and item["python_version"] in python_versions
        ):