chore: bump corssbeam-channel to 0.5.15

Upgrade to avoid the double free on drop

Refs: crossbeam-rs/crossbeam#1187

Author: hcldan

tracing-appender/Cargo.toml

@@ -21,7 +21,7 @@ edition = "2018"
 rust-version = "1.53.0"
 
 [dependencies]
-crossbeam-channel = "0.5.5"
+crossbeam-channel = "0.5.15"
 time = { version = "0.3.2", default-features = false, features = ["formatting", "parsing"] }
 parking_lot = { optional = true, version = "0.12.1" }
 thiserror = "1.0.31"