Update Cooley-Tukey to use correct version of crates

Author: PeanutbutterWarrior

contents/cooley_tukey/code/rust/Cargo.toml

@@ -6,8 +6,8 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rand = "0.8.4"
-rustfft = "6.0.1"
+rand = "0.7.3"
+rustfft = "4.1.0"
 
 [[bin]]
 path = "./fft.rs"