fix(example): resolve clippy warnings in callable_channel example

- Add allow attributes for cast_sign_loss, cast_possible_wrap,
  missing_errors_doc, and redundant_closure_for_method_calls
- Change values.iter() to values for explicit_iter_loop lint

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kakserpom

examples/callable_channel.rs

@@ -29,7 +29,15 @@
 //! unregister_callback($closureId);
 //! ```
 
-#![allow(missing_docs, clippy::must_use_candidate, clippy::missing_safety_doc)]
+#![allow(
+    missing_docs,
+    clippy::must_use_candidate,
+    clippy::missing_safety_doc,
+    clippy::missing_errors_doc,
+    clippy::cast_sign_loss,
+    clippy::cast_possible_wrap,
+    clippy::redundant_closure_for_method_calls
+)]
 #![cfg_attr(windows, feature(abi_vectorcall))]
 
 use std::sync::Arc;
@@ -207,7 +215,7 @@ pub fn parallel_closure_calls(closure_id: i64, values: &ZendHashTable) -> PhpRes
     let mut handles = Vec::new();
 
     // Spawn a thread for each value
-    for (_, val) in values.iter() {
+    for (_, val) in values {
         if let Some(serialized) = SerializedValue::from_zval(val) {
             let channel_clone = channel.clone();
             let handle =