Update parity-scale-codec to prepare for breaking rustc release (#6746)

This updates parity-scale-codec{-derive} to prepare for a rustc release
that would otherwise break the derive implementation:
rust-lang/rust#73084

Cargo.toml

@@ -13,7 +13,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
 pallet-balances = { version = "2.0.0-rc5", default-features = false, path = "../balances" }
-codec = { package = "parity-scale-codec", version = "1.3.1", default-features = false, features = ["derive"] }
+codec = { package = "parity-scale-codec", version = "1.3.4", default-features = false, features = ["derive"] }
 sp-std = { version = "2.0.0-rc5", default-features = false, path = "../../primitives/std" }
 serde = { version = "1.0.101", optional = true }
 sp-runtime = { version = "2.0.0-rc5", default-features = false, path = "../../primitives/runtime" }

benchmarking/Cargo.toml

@@ -12,7 +12,7 @@ description = "FRAME offences pallet benchmarking"
 targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
-codec = { package = "parity-scale-codec", version = "1.3.1", default-features = false }
+codec = { package = "parity-scale-codec", version = "1.3.4", default-features = false }
 frame-benchmarking = { version = "2.0.0-rc5", default-features = false, path = "../../benchmarking" }
 frame-support = { version = "2.0.0-rc5", default-features = false, path = "../../support" }
 frame-system = { version = "2.0.0-rc5", default-features = false, path = "../../system" }
@@ -28,7 +28,6 @@ sp-staking = { version = "2.0.0-rc5", default-features = false, path = "../../..
 sp-std = { version = "2.0.0-rc5", default-features = false, path = "../../../primitives/std" }
 
 [dev-dependencies]
-codec = { package = "parity-scale-codec", version = "1.3.1", features = ["derive"] }
 pallet-staking-reward-curve = { version = "2.0.0-rc5", path = "../../staking/reward-curve" }
 pallet-timestamp = { version = "2.0.0-rc5", path = "../../timestamp" }
 serde = { version = "1.0.101" }
@@ -51,4 +50,5 @@ std = [
 	"sp-runtime/std",
 	"sp-staking/std",
 	"sp-std/std",
+	"codec/std",
 ]