Bump collator version (#970)

Co-authored-by: Wilfried Kopp <wilfried@parity.io>

cumulus/Cargo.lock

@@ -6828,7 +6828,7 @@ dependencies = [
 
 [[package]]
 name = "polkadot-collator"
-version = "5.1.0"
+version = "5.2.0"
 dependencies = [
  "assert_cmd",
  "async-trait",

cumulus/polkadot-parachains/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "polkadot-collator"
-version = "5.1.0"
+version = "5.2.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 build = "build.rs"
 edition = "2021"