docs: update registry agents (#552)

Co-authored-by: benbrandt <2111074+benbrandt@users.noreply.github.com>

Author: acp-release-bot[bot]

docs/get-started/registry.mdx

@@ -431,7 +431,7 @@ Visit [the registry repository on GitHub](https://github.com/agentclientprotocol
   >
     The open source coding agent
     <p class="text-xs mt-3">
-      <code>1.2.8</code>
+      <code>1.2.9</code>
     </p>
   </Card>
   <Card
@@ -507,7 +507,7 @@ Visit [the registry repository on GitHub](https://github.com/agentclientprotocol
   >
     Open-source DevOps agent in Rust with enterprise-grade security
     <p class="text-xs mt-3">
-      <code>0.3.56</code>
+      <code>0.3.57</code>
     </p>
   </Card>
 </CardGroup>