ed448-goldilocks: bump ed448 crate dependency to v0.5.0-rc.0 (#1402)

Author: tarcieri

Cargo.lock

@@ -23,7 +23,7 @@ sha3 = { version = "0.11.0-rc.2", default-features = false }
 subtle = { version = "2.6", default-features = false }
 
 # optional dependencies
-ed448 = { version = "=0.5.0-pre.0", optional = true, default-features = false }
+ed448 = { version = "0.5.0-rc.0", optional = true, default-features = false }
 serdect = { version = "0.4", optional = true }
 signature = { version = "3.0.0-rc.3", optional = true, default-features = false, features = ["digest", "rand_core"] }