remove unused function

src/textual/renderables/_blend_colors.py

@@ -25,25 +25,3 @@ def blend_colors(color1: Color, color2: Color, ratio: float) -> Color:
         g1 + (g2 - g1) * ratio,
         b1 + (b2 - b1) * ratio,
     )
-
-
-def blend_colors_rgb(
-    color1: tuple[int, int, int], color2: tuple[int, int, int], ratio: float
-) -> Color:
-    """Blend two colors given as a tuple of 3 values for red, green, and blue.
-
-    Args:
-        color1: The first color.
-        color2: The second color.
-        ratio: The ratio of color1 to color2.
-
-    Returns:
-        A Color representing the blending of the two supplied colors.
-    """
-    r1, g1, b1 = color1
-    r2, g2, b2 = color2
-    return Color.from_rgb(
-        r1 + (r2 - r1) * ratio,
-        g1 + (g2 - g1) * ratio,
-        b1 + (b2 - b1) * ratio,
-    )