Add missing 11.8.7 docs

[leofang]

Description

closes

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[leofang]

/ok to test cf17015

[leofang]

@rwgk this should be ready, I pushed to the gh-pages branch so this link is live now:
https://nvidia.github.io/cuda-python/12.9.0/release/11.8.7-notes.html

[leofang]

and once we merge this PR this link will work too
https://nvidia.github.io/cuda-python/latest/release/11.8.7-notes.html

[rwgk]

I updated the link here:

https://github.com/NVIDIA/cuda-python/releases/tag/v11.8.7

That's now using https://nvidia.github.io/cuda-python/12.9.0/release/11.8.7-notes.html, which seems best to me, because then we can easily easy with 12.x release went with with 11.x, and it's maybe a little more future proof.

(https://nvidia.github.io/cuda-python/latest/release/11.8.7-notes.html doesn't seem to work, yet?)

[leofang]

(https://nvidia.github.io/cuda-python/latest/release/11.8.7-notes.html doesn't seem to work, yet?)

It needs to wait until the doc preview CI runs on main

[github-actions]

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