replace fxhash crate with rustc-hash (#588)

packages/web/Cargo.toml

@@ -21,7 +21,7 @@ js-sys = "0.3.56"
 wasm-bindgen = { version = "0.2.79", features = ["enable-interning"] }
 wasm-bindgen-futures = "0.4.29"
 log = { version = "0.4.14" }
-fxhash = "0.2.1"
+rustc-hash = "1.1.0"
 console_error_panic_hook = { version = "0.1.7", optional = true }
 once_cell = "1.9.0"
 anyhow = "1.0.53"