Bump tokio from 1.11.0 to 1.12.0 (#3910)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.11.0 to 1.12.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.11.0...tokio-1.12.0)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

node/test/service/Cargo.toml

@@ -11,7 +11,7 @@ hex = "0.4.3"
 tracing = "0.1.27"
 rand = "0.8.3"
 tempfile = "3.2.0"
-tokio = "1.10.0"
+tokio = "1.12.0"
 
 # Polkadot dependencies
 polkadot-overseer = { path = "../../overseer" }
@@ -60,4 +60,4 @@ substrate-test-client = { git = "https://github.com/paritytech/substrate", branc
 pallet-balances = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 serde_json = "1.0.67"
 substrate-test-utils = { git = "https://github.com/paritytech/substrate", branch = "master" }
-tokio = { version = "1.11", features = ["macros"] }
+tokio = { version = "1.12", features = ["macros"] }

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

@@ -44,4 +44,4 @@ substrate-test-utils = { git = "https://github.com/paritytech/substrate", branch
 sc-service = { git = "https://github.com/paritytech/substrate", branch = "master" }
 sp-keyring = { git = "https://github.com/paritytech/substrate", branch = "master" }
 
-tokio = { version = "1.11", features = ["macros"] }
+tokio = { version = "1.12", features = ["macros"] }

utils/staking-miner/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 
 [dependencies]
 codec = { package = "parity-scale-codec", version = "2.0.0" }
-tokio = { version = "1.11", features = ["macros"] }
+tokio = { version = "1.12", features = ["macros"] }
 log = "0.4.11"
 env_logger = "0.9.0"
 structopt = "0.3.23"