Update stm32f4xx-hal to 0.22

Author: datdenkikniet

Cargo.toml

@@ -22,7 +22,7 @@ features = ["smoltcp-phy", "stm32f429", "async-await"]
 volatile-register = "0.2"
 aligned = "0.4"
 stm32f7xx-hal = { version = "0.8", optional = true }
-stm32f4xx-hal = { version = "0.20", optional = true }
+stm32f4xx-hal = { version = "0.22", optional = true }
 stm32f4 = { version = "0.15", optional = true }
 stm32f1xx-hal = { version = "0.10", optional = true }
 ieee802_3_miim = "0.8"