Doc: Remove reference to RFC6265bis from SameSite=None note

Author: iqra-codes

Doc/library/http.cookies.rst

@@ -152,8 +152,8 @@ Morsel Objects
    cross-site requests. This helps to mitigate CSRF attacks. Valid values are
    "Strict" (never sent with cross-site requests), "Lax" (sent with top-level
    navigation), and "None" (always sent). When using "None", the "secure"
-   attribute must also be set, as required by modern browsers per
-   `RFC6265bis <https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-rfc6265bis>`_.
+   attribute must also be set, as required by modern browsers.
+
 
    The attribute :attr:`partitioned` indicates to user agents that these
    cross-site cookies *should* only be available in the same top-level context