Revert criterion back to 0.4.

It's just a dev-dependency, and the newer versions depend on `alloca`
which is more work to cross-compile.

Author: sunfishcode

Cargo.toml

@@ -81,7 +81,7 @@ static_assertions = "1.1.0"
 once_cell = "1.20.3"
 
 [target.'cfg(all(criterion, not(any(target_os = "emscripten", target_os = "wasi"))))'.dev-dependencies]
-criterion = "0.8"
+criterion = "0.4"
 
 # Add Criterion configuration, as described here:
 # <https://bheisler.github.io/criterion.rs/book/getting_started.html#step-1---add-dependency-to-cargotoml>