Release sp-core 4.0.0 (#10447)

* Bump versions of sp-core and dependencies to v4.0.0

* Update references from `4.0.0-dev` –> `4.0.0`

* Funny whitespace

* Funny whitespace 2

substrate/primitives/core/hashing/proc-macro/Cargo.toml

@@ -19,4 +19,4 @@ proc-macro = true
 syn = { version = "1.0.81", features = ["full", "parsing"] }
 quote = "1.0.6"
 proc-macro2 = "1.0.29"
-sp-core-hashing = { version = "4.0.0-dev", path = "../", default-features = false }
+sp-core-hashing = { version = "4.0.0", path = "../", default-features = false }