Fix test expectations for multiline descender line spacing

The change from 'A' to 'Aj' in getbbox correctly accounts for font
descenders, increasing multiline text bbox height by 4px for fonts
with descenders (like FreeMono.ttf at size 20).

Updated test_textbbox_stroke expected values:
- stroke_width=2: bottom 44 → 48
- stroke_width=4: bottom 50 → 54

Author: armorbreak001

Tests/test_imagedraw.py

@@ -1376,8 +1376,8 @@ def test_textbbox_stroke() -> None:
     # Act / Assert
     assert draw.textbbox((2, 2), "A", font, stroke_width=2) == (0, 4, 16, 20)
     assert draw.textbbox((2, 2), "A", font, stroke_width=4) == (-2, 2, 18, 22)
-    assert draw.textbbox((2, 2), "ABC\nAaaa", font, stroke_width=2) == (0, 4, 52, 44)
-    assert draw.textbbox((2, 2), "ABC\nAaaa", font, stroke_width=4) == (-2, 2, 54, 50)
+    assert draw.textbbox((2, 2), "ABC\nAaaa", font, stroke_width=2) == (0, 4, 52, 48)
+    assert draw.textbbox((2, 2), "ABC\nAaaa", font, stroke_width=4) == (-2, 2, 54, 54)
 
 
 @skip_unless_feature("freetype2")