Update index.md

[gmloose]

Updated the Prerequisites.

Closes #1102

Refer to the page with officially supported Python versions, instead of naming the version number here, to avoid that this information gets out-of-date.

[github-actions]

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 index.md   | 4 ++--
 md5sum.txt | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

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⏱️ Updated at 2025-08-29 17:21:53 +0000

[ineelhere]

Thanks for the update. Cheers!