Switch to edition 2021 (#4976)

* Switch to edition 2021

* Reset bridges

* Fix compilation

* Fix test-runtime

* Fix malus

polkadot/parachain/test-parachains/Cargo.toml

@@ -3,7 +3,7 @@ name = "test-parachains"
 version = "0.9.17"
 authors = ["Parity Technologies <admin@parity.io>"]
 description = "Integration tests using the test-parachains"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 tiny-keccak = "2.0.2"

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

@@ -3,7 +3,7 @@ name = "test-parachain-adder"
 version = "0.9.17"
 authors = ["Parity Technologies <admin@parity.io>"]
 description = "Test parachain which adds to a number as its state transition"
-edition = "2018"
+edition = "2021"
 build = "build.rs"
 
 [dependencies]

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

@@ -3,7 +3,7 @@ name = "test-parachain-adder-collator"
 version = "0.9.17"
 authors = ["Parity Technologies <admin@parity.io>"]
 description = "Collator for the adder test parachain"
-edition = "2018"
+edition = "2021"
 
 [[bin]]
 name = "adder-collator"

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

@@ -3,7 +3,7 @@ name = "test-parachain-halt"
 version = "0.9.17"
 authors = ["Parity Technologies <admin@parity.io>"]
 description = "Test parachain which executes forever"
-edition = "2018"
+edition = "2021"
 build = "build.rs"
 
 [dependencies]