context_server: Update types to reflect latest protocol version (2025-03-26) (#32377)

This updates the `types.rs` file to reflect the latest version of the
MCP spec. Next up is making use of some of these new capabilities. Would
also be great to add support for [Streamable HTTP
Transport](https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#streamable-http)

Release Notes:

- N/A

crates/agent/src/context_server_tool.rs

@@ -123,6 +123,9 @@ impl Tool for ContextServerTool {
                         types::ToolResponseContent::Image { .. } => {
                             log::warn!("Ignoring image content from tool response");
                         }
+                        types::ToolResponseContent::Audio { .. } => {
+                            log::warn!("Ignoring audio content from tool response");
+                        }
                         types::ToolResponseContent::Resource { .. } => {
                             log::warn!("Ignoring resource content from tool response");
                         }