Add changes for api version 2024-10-01

docs/backend-requests/versioning/available-versions.mdx

@@ -5,6 +5,14 @@ description: A list of the available API versions and their breaking changes.
 
 Below is a list of all the available API versions with their respective breaking changes.
 
+### 2024-10-01
+
+- Notification for new sign ins to users' accounts feature becomes available
+- The response for Sign Ins with an email address that matches a **SAML connection** is updated : 
+  * Instead of responding with a status of `needs_identifier` the API will now return a status of `needs_first_factor`
+  * The email address that matched will be returned in the identifier field. 
+  * The only strategy that will be included in supported first factors is `enterprise_sso`.
+
 ### 2021-02-05
 
 The initial API version was released on 2021-02-05 as part of the first Clerk release. It predates the versioning system. All changes made to it since then are backwards compatible.