harfbuzz 14.6.0

HarfBuzz text shaping engine

Release notes

- Fix shaping failures caused by out-of-range glyph IDs, a regression from 11.4.0.
- Update experimental beyond-64k support to the final ISO Open Font Format 5th edition. This support remains disabled by default.
- Add support for the `DMAP` table.
- Support `FeatureVariations` 1.1 lookup variations, including subsetting and instancing.
- Update `VARC` to the revised variation-store format. The new format is incompatible with the previous one.
- Various `VARC` fixes.
- Fix background color and stride handling in the experimental raster library.
- Improve the experimental Rust shaper (HarfRust) and font functions (`fontations`), and update HarfRust to 0.14.
- Various subsetting fixes and improvements.
- Various fixes for malformed fonts.
- Various build and CI fixes.

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