Test apng repeated seeks 3 times instead of 5.

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Author: esoma

Tests/test_file_apng.py

@@ -692,9 +692,8 @@ def test_different_modes_in_later_frames(mode, default_image, duplicate, tmp_pat
 
 
 def test_apng_repeated_seeks_give_correct_info() -> None:
-    # https://github.com/python-pillow/Pillow/issues/7700
     with Image.open("Tests/images/apng/repeated_seeks_give_correct_info.png") as im:
-        for i in range(5):
+        for i in range(3):
             im.seek(0)
             assert im.info["duration"] == 4000
             im.seek(1)