jgm/pandoc 3.1.12.1

pandoc 3.1.12.1

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EPUB writer: omit EPUBv3-specific accessibility features on epub2 (#9469). Fixes a regression in 3.1.12.

More fixes for SVG ids with --self-contained (#9467). This generalizes the fix to #9420 so it applies to things like style="fill(url(#..." and should fix problems with SVGs including gradients.

Powerpoint writer: properly handle math in headings and tables (#9465). This ensures that paragraphs containing math are wrapped in a mc:AlternateContent node as required.

Makefile: make validate-epub check v2 output too.