acp: Update to 0.0.30 (#36643)

See: https://github.com/zed-industries/agent-client-protocol/pull/20

Release Notes:

- N/A

crates/acp_thread/src/acp_thread.rs

@@ -1381,7 +1381,7 @@ impl AcpThread {
                         let canceled = matches!(
                             result,
                             Ok(Ok(acp::PromptResponse {
-                                stop_reason: acp::StopReason::Canceled
+                                stop_reason: acp::StopReason::Cancelled
                             }))
                         );