Set polkadot version in one place (#6095)

* rust 1.64 enables workspace properties

* add edition, repository and authors.

* of course, update the version in one place.

Co-authored-by: Andronik <write@reusable.software>

polkadot/parachain/test-parachains/adder/Cargo.toml

@@ -1,10 +1,10 @@
 [package]
 name = "test-parachain-adder"
-version = "0.9.33"
-authors = ["Parity Technologies <admin@parity.io>"]
 description = "Test parachain which adds to a number as its state transition"
-edition = "2021"
 build = "build.rs"
+edition.workspace = true
+version.workspace = true
+authors.workspace = true
 
 [dependencies]
 parachain = { package = "polkadot-parachain", path = "../../", default-features = false, features = [ "wasm-api" ] }