bump dependency on bitflags

upgrade to version 2.x

Author: jnqnfe

pulse-binding/Cargo.toml

@@ -14,7 +14,7 @@ rust-version = "1.63"
 
 [dependencies]
 libc = "0.2"
-bitflags = "1.3"
+bitflags = "2.0"
 num-traits = "0.2"
 num-derive = "0.4"
 libpulse-sys = { path = "../pulse-sys", version = "1.21", default-features = false }