Update flume to 0.12

Author: lovasoa

Cargo.lock

@@ -125,7 +125,7 @@ futures-intrusive = "0.5.0"
 futures-util = { version = "0.3.19", default-features = false, features = ["alloc", "sink", "io"] }
 # used by the SQLite worker thread to block on the async mutex that locks the database handle
 futures-executor = { version = "0.3.19", optional = true }
-flume = { version = "0.11.0", optional = true, default-features = false, features = ["async"] }
+flume = { version = "0.12.0", optional = true, default-features = false, features = ["async"] }
 hex = "0.4.3"
 hmac = { version = "0.12.0", default-features = false, optional = true }
 itoa = "1.0.1"