docs: add cloudflared version requirement note for source IP anchoring and DNS resolution

Author: nouvellonsteph

src/content/docs/cloudflare-one/policies/gateway/egress-policies/egress-cloudflared.mdx

@@ -40,6 +40,11 @@ To learn more about how Gateway applies hostname-based egress policies, refer to
 
 ## Prerequisites
 
+::::note[Cloudflare Tunnel version requirement]
+If you're aiming to use Cloudflare Tunnel for source IP anchoring and DNS resolution, you must use `cloudflared` version 2025.7.0 or later.
+::::
+
+
 User traffic is on-ramped to Gateway using one of the following methods:
 
 <Render