libffi 3.4.4 -> 3.4.6

[YSaxon]

adding urls and hashes for libffi versions 3.4.5 and 3.4.6 (existing is 3.4.4)
I haven't actually figured out how to test it, but it's a pretty simple PR just adding urls and hashes, and I assume you have CI that will test it in any case.

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[github-actions]

🤖 Beep Boop! This pull request is making changes to 'recipes/libffi//'.

👋 @Hopobcn you might be interested. 😉

[valgur]

Thanks! LGTM, but don't add v3.4.5.

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[uilianries]

@YSaxon Thank you for your contribution and effort!

This PR is now surpassed by the PR #23362 and will be closed.