download: emphasise latest stable versions in bold for macOS/iOS/Android

Merged Tim-Philipp Müller requested to merge tpm/www:download-page into main

Not quite sure why we list 1.18 versions on our download page as well. It's not like it isn't confusing enough already, but as long as we do let's at least highlight the latest versions in bold.

Edited by Tim-Philipp Müller

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