Replace cargo-cranky with workspace lints (#4413)

Replace `cargo-cranky` (which has served us well) with workspace lints

examples/user_attention/src/main.rs

@@ -1,3 +1,6 @@
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+#![allow(rustdoc::missing_crate_level_docs)] // it's an example
+
 use eframe::{egui, CreationContext, NativeOptions};
 use egui::{Button, CentralPanel, Context, UserAttentionType};