Update Rust crate yew to 0.21.0

Cargo.toml

@@ -12,7 +12,7 @@ publish = false
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 [dependencies]
-yew = "0.19.3"
+yew = "0.21.0"
 web-sys = { version = "0.3.67", features = ["Event","EventTarget","InputEvent"] }
 wasm-bindgen = "0.2.90"
 numsep = "0.1.12"