fontconfig: Prefer semi-bold as bold weight even for system selection

kitty/fast_data_types.pyi

@@ -288,6 +288,8 @@ FC_MONO: int = 100
 FC_DUAL: int
 FC_WEIGHT_REGULAR: int
 FC_WEIGHT_BOLD: int
+FC_WEIGHT_SEMIBOLD: int
+FC_WEIGHT_MEDIUM: int
 FC_WIDTH_NORMAL: int
 FC_SLANT_ROMAN: int
 FC_SLANT_ITALIC: int

kitty/fonts/fontconfig.py

@@ -9,11 +9,13 @@ from kitty.fast_data_types import (
     FC_MONO,
     FC_SLANT_ITALIC,
     FC_SLANT_ROMAN,
-    FC_WEIGHT_BOLD,
     FC_WEIGHT_REGULAR,
     FC_WIDTH_NORMAL,
     fc_list,
 )
+from kitty.fast_data_types import (
+    FC_WEIGHT_SEMIBOLD as FC_WEIGHT_BOLD,
+)
 from kitty.fast_data_types import fc_match as fc_match_impl
 from kitty.typing import FontConfigPattern