[DOC] update cuda13 related jars in download doc [skip ci]

[nvliyuan]

Fix #14019
Add cuda13 jars on download page.

[nvliyuan]

Is this still correct? CC @NvTimLiu

This package is built against CUDA 12.9. It is tested on V100, T4, A10, A100, L4, H100 and GB100 GPUs with 
CUDA 12.9.  

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Greptile Summary

Added CUDA 13 support documentation to the download page, including download links, signatures, and Maven dependencies for all processor architectures (x86_64 and arm64) and Scala versions (2.12 and 2.13).

Changes Made

• Reorganized CUDA 12 downloads under a dedicated "CUDA 12" section header
• Added new "CUDA 13" section with comprehensive jar download links following the same structure
• Included all four combinations: x86_64 (Scala 2.12/2.13) and arm64 (Scala 2.12/2.13)
• All links follow consistent naming pattern with cuda13 and cuda13-arm64 classifiers

Issues Found

• The documentation note at the bottom still references only "CUDA 12.9", which is now incomplete given that CUDA 13 variants are also available. This needs to be updated to clarify the CUDA versions for each variant.

Confidence Score: 4/5

• This PR is safe to merge with minimal risk - it's a documentation-only change adding CUDA 13 jar references
• Score reflects that this is a straightforward documentation update with consistent formatting and complete coverage of all CUDA 13 variants. The only issue is an outdated note about CUDA versions that should be updated for clarity.
• The note at lines 95-96 in docs/download.md needs updating to accurately reflect both CUDA 12 and CUDA 13 variants

Important Files Changed

Filename	Overview
docs/download.md	Added CUDA 13 section with jar download links for all processor/Scala combinations. Documentation note about CUDA versions needs updating to reflect both CUDA 12 and 13 variants.

Sequence Diagram

sequenceDiagram
    participant Author as PR Author
    participant Docs as download.md
    participant Maven as Maven Repository
    participant Users as End Users
    
    Author->>Docs: Add "CUDA 12" section header
    Author->>Docs: Add "CUDA 13" section with table
    Author->>Docs: Include x86_64 Scala 2.12 link
    Author->>Docs: Include x86_64 Scala 2.13 link
    Author->>Docs: Include arm64 Scala 2.12 link
    Author->>Docs: Include arm64 Scala 2.13 link
    
    Note over Docs: Each entry includes:<br/>- Download jar link<br/>- Signature link<br/>- Maven dependency XML
    
    Users->>Docs: Read documentation
    Users->>Maven: Download CUDA 13 jars
    
    Note over Docs,Users: Issue: CUDA version note<br/>still references only 12.9

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Additional Comments (1)

1. docs/download.md, line 95-96 (link)

   logic: Documentation now covers both CUDA 12 and CUDA 13 variants, but this note only mentions CUDA 12.9. Update to clarify which CUDA versions the different jar variants are built against.

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