Removed specific leak check

Tests/test_jxl_leaks.py

@@ -1,25 +0,0 @@
-from __future__ import annotations
-
-from io import BytesIO
-
-from PIL import Image
-
-from .helper import PillowLeakTestCase, skip_unless_feature
-
-TEST_FILE = "Tests/images/hopper.jxl"
-
-
-@skip_unless_feature("jpegxl")
-class TestJpegXlLeaks(PillowLeakTestCase):
-    mem_limit = 6 * 1024  # kb
-    iterations = 1000
-
-    def test_leak_load(self) -> None:
-        with open(TEST_FILE, "rb") as f:
-            im_data = f.read()
-
-        def core() -> None:
-            with Image.open(BytesIO(im_data)) as im:
-                im.load()
-
-        self._test_leak(core)