Bug 1718787 [wpt PR 29544] - Update wpt metadata, a=testonly

wpt-pr: 29544
wpt-type: metadata

testing/web-platform/meta/cookies/size/attributes.www.sub.html.ini

@@ -0,0 +1,6 @@
+[attributes.www.sub.html]
+  [Too long path attribute (>1024 bytes) is ignored; previous valid path wins.]
+    expected: FAIL
+
+  [Too long domain attribute (>1024 bytes) is ignored; previous valid domain wins.]
+    expected: FAIL