Clippy fixes (#2033)

* clippy fixed

* wasm clippy

* clippy fixes

* post clippy fmt

* last clippy fix

subxt/examples/block_decoding_dynamic.rs

@@ -35,7 +35,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                 }
             }
             println!("    Fields:");
-            println!("      {}\n", fields);
+            println!("      {fields}\n");
         }
     }