pango: Update to version 1.50.13

pango: Update to version 1.50.13

- Update from version 1.50.6 to 1.50.13
- Update of rootfile
- Changelog
Overview of changes in 1.50.13, 20-02-2023
- win32: Add back fallback for empty fontsets
- win32: Improve DirectWrite support
- Fix word segmentation for Japanese
- Don't set backspace-deletes-char for math symbols
- coretext: Fix a crash
- cairo: Apply metrics hinting to underlines too
- Treat COLRv1 fonts as color fonts
Overview of changes in 1.50.12, 18-11-2022
- Fix weight conversion on MacOS
- Update to Unicode 15
- Some introspection annotation fixes
- Improve PangoAttrList serialization
- Fix char offset calculatiosn in multi-paragraph
  layouts
Overview of changes in 1.50.11, 03-10-2022
- Don't crash for lack of fonts
- Avoid a crash in shaping
Overview of changes in 1.50.10, 16-09-2022
- Avoid some unnecessary strdups
- Fix line height computations with a non-trivial CTM
Overview of changes in 1.50.9, 09-08-2022
- Apply show flags to line separators
- Fix a thread-safety problem
Overview of changes in 1.50.8, 02-07-2022
- Add some properties to fontmap and family
- Fix handling of ligature carets in mixed directions
Overview of changes in 1.50.7, 14-04-2022
- coretext: Fix the build
- editing: Fix moving across paragraph boundaries in rtl
- layout: Try harder to survive without fonts
- Windows: Register a sans-serif font
- Windows: Try harder to load a font

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>