fix(bench): don't enable read_blackbox by default

Author: Berrysoft

compio/Cargo.toml

@@ -48,7 +48,7 @@ compio-buf = { workspace = true, features = ["bumpalo"] }
 compio-runtime = { workspace = true, features = ["criterion"] }
 compio-macros = { workspace = true }
 
-criterion = { workspace = true, features = ["async_tokio", "real_blackbox"] }
+criterion = { workspace = true, features = ["async_tokio"] }
 futures-channel = { workspace = true }
 futures-util = { workspace = true }
 rand = "0.8.5"
@@ -120,6 +120,8 @@ nightly = [
     "try_trait_v2",
 ]
 
+real_blackbox = ["criterion/real_blackbox"]
+
 [[example]]
 name = "basic"
 required-features = ["macros"]