use experimental feature

Cargo.toml

@@ -5,6 +5,6 @@ edition = "2024"
 
 [dependencies]
 thiserror = "2"
-serialport = "4"
+serialport = { version = "4.7.4-alpha.0", git = "https://github.com/us-irs/serialport-rs.git", branch = "add-vmin-vtime-and-non-blocking-support" }
 cobs = "0.5"
 log = "0.4"