Fonts: Change ImFontConfig::FontNo back to int from S8 (#8775)

When used with FreeType this value is passed as `face_index` which needs to be 32-bits.

# Conflicts:
#	docs/CHANGELOG.txt

docs/CHANGELOG.txt

@@ -50,6 +50,10 @@ Other changes:
 - Fonts: set a maximum font size of 512.0f at ImGui:: API level to reduce
   edge cases (e.g. out of memory errors). ImDrawList:: API doesn't have the
   constraint. (#8758)
+- Fonts: Restore ImFontConfig::FontNo being a 32-bits value as this is needed
+  to pass full range of information into e.g. FreeType's face_index, as higher
+  bits are used from FreeType 2.6.1. (#8775) [@Valakor]
+  (the field has been erroneously reduced from 32-bits to 8-bit in 1.92.0)
 - Textures: Fixed support for `#define ImTextureID_Invalid` to non-zero value:
   ImTextureData() was incorrectly cleared with zeroes. (#8745) [@rachit7645]
 - Demo: Added "Text -> Font Size" demo section. (#8738) [@Demonese]