MAINT: update Cargo.toml, lock dep version

Author: lacabra

enclave/safetrace/enclave/Cargo.toml

@@ -12,7 +12,7 @@ crate-type = ["staticlib"]
 default = []
 
 [dependencies]
-GSL = "*"
+GSL = "0.4"
 enigma-types = { git = "https://github.com/enigmampc/enigma-core.git", branch="develop", default-features = false, features = ["sgx"] }
 enigma-crypto = { git = "https://github.com/enigmampc/enigma-core.git", branch="develop", default-features = false, features = ["sgx", "asymmetric"] }
 enigma-tools-t = { git = "https://github.com/enigmampc/enigma-core.git", branch="develop" }