DOC: Drop all mentions of CUDA 11 from installation guides and support policies

[Copilot]

This PR updates the documentation to remove CUDA 11 support references and focus on CUDA 12 and 13, reflecting the current state where CUDA 11 support has been dropped.

Changes Made

Support Policy Updates:

• Updated cuda_bindings/docs/source/support.rst to indicate that CUDA 12 & 13 are actively maintained instead of CUDA 11 & 12

Installation Guide Updates:
Updated cuda_core/docs/source/install.rst to:

• Change compatibility table from "CUDA 11 | CUDA 12" to "CUDA 12 | CUDA 13"
• Update CUDA Toolkit version requirements from "11.2-11.8 | 12.x" to "12.x | 13.x"
• Update minimum driver version requirements to reflect CUDA 12/13 specifications
• Update CUDA 13 driver requirements to "580.65+ (Linux), 580.88+ (Windows)"
• Change PyPI installation examples from [cu11] to [cu13]
• Change conda installation examples from cuda-version=11 to cuda-version=13
• Update dependency requirements from "11.x or 12.x" to "12.x or 13.x"

Release Notes Updates:

• Added CUDA 11 support deprecation notice to cuda_core/docs/source/release/0.X.Y-notes.rst stating that CUDA 11 support is no longer tested and may or may not work with cuda.bindings and CTK 11.x

Files Preserved

As requested, historical documents remain unchanged:

• All release notes in release/ directories are preserved
• Technical documentation references (e.g., module/runtime.rst mentioning when CUDA 11.2 features were introduced) are preserved

This ensures users have clear guidance on current supported CUDA versions while maintaining historical context in appropriate documentation sections.

Fixes #887.

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[leofang]

@copilot add a release note entry to cuda.core 0.X.Y, mentioning that CUDA 11 support is no longer tested and it may or may not work with cuda.bindings and CTK 11.x

[Copilot]

@copilot add a release note entry to cuda.core 0.X.Y, mentioning that CUDA 11 support is no longer tested and it may or may not work with cuda.bindings and CTK 11.x

Added a release note entry to cuda.core 0.X.Y-notes.rst mentioning that CUDA 11 support is no longer tested and may or may not work with cuda.bindings and CTK 11.x. Commit: 08ac62f

[leofang]

Thanks, Rob! Since this is a minor doc change, let me admin-merge and rebuild the docs on main.