Log Message:
pango: update to 1.40.12.

Overview of changes between 1.40.11 and 1.40.12
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- Fix pango_default_break for sentence start/end (#785978)
- Fix multilib issue in pango-enum-types.h (#786887)

Overview of changes between 1.40.10 and 1.40.11
===============================================
- Fix backspacing for more Emoji sequences
- Make tests run faster

Overview of changes between 1.40.9 and 1.40.10
==============================================
- Update Emoji data to version 5
- Apply gravity across spans in markup (#784243)
- Support variation selectors for shaping
- CoreText: Rely on CGFont for scaling (#782393)
- Fix grapheme breaks and backspacing for Emoji

Overview of changes between 1.40.8 and 1.40.9
=============================================
- Build and dist fixes
- Fix build on Windows with MSVC (#783274)