docs: update registry agents

Author: benbrandt

docs/get-started/registry.mdx

@@ -236,7 +236,7 @@ Visit [the registry repository on GitHub](https://github.com/agentclientprotocol
   >
     ACP wrapper for Anthropic's Claude
     <p class="text-xs mt-3">
-      <code>0.20.2</code>
+      <code>0.21.0</code>
     </p>
   </Card>
   <Card
@@ -770,7 +770,7 @@ Visit [the registry repository on GitHub](https://github.com/agentclientprotocol
   >
     Code and build agents with comprehensive multi-provider support
     <p class="text-xs mt-3">
-      <code>0.5.8</code>
+      <code>0.5.9</code>
     </p>
   </Card>
   <Card