chore(notification): remove unused dev-deps (#3372)

Author: FabianLars

Cargo.lock

@@ -43,10 +43,5 @@ windows-version = { version = "0.1", optional = true }
 [target."cfg(any(target_os = \"macos\", windows, target_os = \"linux\", target_os = \"dragonfly\", target_os = \"freebsd\", target_os = \"openbsd\", target_os = \"netbsd\"))".dependencies]
 notify-rust = "4.11"
 
-[dev-dependencies]
-color-backtrace = "0.7"
-ctor = "0.2"
-maplit = "1"
-
 [features]
 windows7-compat = ["win7-notifications", "windows-version"]