Update dependency jgm/pandoc to v3.1.12

This MR contains the following updates:

Package	Type	Update	Change
jgm/pandoc	ironbank-github	patch	3.1.11 -> 3.1.12

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Release Notes

jgm/pandoc (jgm/pandoc)

v3.1.12

Compare Source

• 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.

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