deps: bump cmov to 0.4 as all other versions were yanked

see RustCrypto/utils#1304

Author: jqnatividad

Cargo.toml

@@ -27,7 +27,7 @@ opt-level = 3
 aligned-vec = "0.6.1"
 array-init = "2.1.0"
 az = "1"
-cmov = "0.3"
+cmov = "0.4"
 divrem = "1"
 num-traits = "0.2"
 ordered-float = "5"