sile 0.12.0

[alerque]

Upstream release

No dependency changes since last release.

One new optional dependency, the new MATH typesetting package defaults to Libertinus Serif. Since Homebrew doesn't install even the current body text default Gentium Plus, I guess installing the optional math font is out of the cards. It is available in Homebrew Fonts if people are looking for it.

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[BrewTestBot]

🤖 A scheduled task has triggered a merge.