examples: suppress false positive clippy lint (#2846)

Signed-off-by: Alex Saveau <saveau.alexandre@gmail.com>

examples/examples/sloggish/sloggish_subscriber.rs

@@ -239,6 +239,7 @@ impl Subscriber for SloggishSubscriber {
             self.print_indent(&mut stderr, indent).unwrap();
             stack.push(span_id.clone());
             if let Some(data) = data {
+                #[allow(clippy::map_identity)] // TODO remove in Rust 1.77
                 self.print_kvs(&mut stderr, data.kvs.iter().map(|(k, v)| (k, v)), "")
                     .unwrap();
             }