remove sp-serializer which is not useful (#14134)

* remove `sp-serializer` which is not useful

* Update primitives/core/Cargo.toml

* fix cargo.toml

* ".git/.scripts/commands/fmt/fmt.sh"

---------

Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: command-bot <>

substrate/Cargo.lock

@@ -10900,7 +10900,6 @@ dependencies = [
  "sp-debug-derive",
  "sp-externalities",
  "sp-runtime-interface",
- "sp-serializer",
  "sp-std",
  "sp-storage",
  "ss58-registry",
@@ -11218,14 +11217,6 @@ dependencies = [
  "substrate-wasm-builder",
 ]
 
-[[package]]
-name = "sp-serializer"
-version = "4.0.0-dev"
-dependencies = [
- "serde",
- "serde_json",
-]
-
 [[package]]
 name = "sp-session"
 version = "4.0.0-dev"