fix wrong edition

Author: jwenjian

src-tauri/Cargo.toml

@@ -3,7 +3,7 @@ name = "cover-fun"
 version = "0.1.2"
 description = "An app makes you no more nervous when online interview"
 authors = ["jwenjian"]
-edition = "2025"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html