pango: Update to version 1.54.0

pango: Update to version 1.54.0

- Update from version 1.52.0 to 1.54.0
- Update of rootfile
- Changelog
    1.54.0
	- Build fixes
	- Memory leak fixes
	- Drop the install-tests build option
	- Add build-examples and build-tests build options
	- Require meson 0.63
	- Add pango_item_get_char_offset
	- Update to Unicode 15.1
	- Fix wrong use of GWeakRef, leading to crashes
    1.52.2
	- coretext: Implement reload_font
	- coretext: Use Menlo instead of Courier for monospace
	- win32: Avoid a double free
	- Update to Unicode 15.1
	- Simplify hexbox drawing
    1.52.1
	- Fix hexbox drawing

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