cargo: Bump to 2024 edition

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "wldash2"
 version = "0.2.0"
-edition = "2021"
+edition = "2024"
 
 [profile.release]
 #debug = true

src/state.rs

@@ -141,7 +141,7 @@ impl State {
                 activation.activate(key, surface);
                 let activation_token = activation.get_activation_token(qh, ());
                 activation_token.commit();
-                env::remove_var("XDG_ACTIVATION_TOKEN");
+                unsafe { env::remove_var("XDG_ACTIVATION_TOKEN"); }
             }
             _ => (),
         }