sec1: bump serdect dependency to v0.3.0-rc.0 (#1523)

Author: tarcieri

Cargo.lock

@@ -21,7 +21,7 @@ base16ct = { version = "0.2", optional = true, default-features = false }
 der = { version = "0.8.0-rc.0", optional = true, features = ["oid"] }
 hybrid-array = { version = "0.2.0-rc.9", optional = true, default-features = false }
 pkcs8 = { version = "0.11.0-rc.1", optional = true, default-features = false }
-serdect = { version = "=0.3.0-pre.0", optional = true, default-features = false, features = ["alloc"] }
+serdect = { version = "0.3.0-rc.0", optional = true, default-features = false, features = ["alloc"] }
 subtle = { version = "2", optional = true, default-features = false }
 zeroize = { version = "1", optional = true, default-features = false }