xtask/pipeline/publish: Drop manual "wait"

for crates.io to catch up, which is obsolete with rust 1.66 and up.
Cargo does that on its own now. See
rust-lang/cargo#11062

xtask/src/pipelines.rs

@@ -357,10 +357,6 @@ pub fn publish(sh: &Shell, flags: flags::Publish) -> anyhow::Result<()> {
                         println!("Aborting publish for crate '{crate_name}'");
                         return Err::<(), _>(err);
                     }
-                } else {
-                    println!("Waiting for crates.io to catch up...");
-                    std::thread::sleep(std::time::Duration::from_secs(15));
-                    break;
                 }
             }
         }