Link.__eq__: return NotImplemented instead of raising NotImplementedError (#7611)

scrapy/link.py

@@ -39,7 +39,7 @@ class Link:
 
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, Link):
-            raise NotImplementedError
+            return NotImplemented
         return (
             self.url == other.url
             and self.text == other.text

tests/test_link.py

@@ -55,3 +55,7 @@ class TestLink:
     def test_bytes_url(self):
         with pytest.raises(TypeError):
             Link(b"http://www.example.com/\xc2\xa3")
+
+    def test_eq_non_link(self):
+        url = "http://example.com"
+        assert Link(url) != url