bump to use hal's alpha.1

Author: ithinuel

Cargo.toml

@@ -10,7 +10,7 @@ repository = "https://github.com/rp-rs/ws2812-pio-rs/"
 [dependencies]
 embedded-hal = "0.2.5"
 fugit = "0.3.5"
-rp2040-hal = "0.9.0"
+rp2040-hal = "0.9.0-alpha.1"
 pio = "0.2.0"
 smart-leds-trait = "0.2.1"
 nb = "1.0.0"