Bump sp-keystore from 0.27.0 to 0.28.0

Bumps [sp-keystore](https://github.com/paritytech/substrate) from 0.27.0 to 0.28.0.
- [Release notes](https://github.com/paritytech/substrate/releases)
- [Changelog](https://github.com/paritytech/substrate/blob/master/docs/CHANGELOG.md)
- [Commits](https://github.com/paritytech/substrate/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>

node/Cargo.toml

@@ -54,7 +54,7 @@ sc-basic-authorship = { version = "0.10.0-dev", git = "https://github.com/parity
 substrate-frame-rpc-system = { version = "4.0.0-dev", git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.42" }
 pallet-transaction-payment-rpc = { version = "4.0.0-dev", git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.42" }
 # for OCW pallets
-sp-keystore = {version = "0.27.0"}
+sp-keystore = {version = "0.28.0"}
 
 # These dependencies are used for runtime benchmarking
 frame-benchmarking = { version = "4.0.0-dev", git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.42" }

pallets/ocw/Cargo.toml

@@ -30,7 +30,7 @@ lite-json = { version = "0.2.0", default-features = false }
 sp-core = { version = "7.0.0", git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.42" }
 sp-io = { version = "7.0.0", git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.42" }
 sp-runtime = { version = "7.0.0", git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.42" }
-sp-keystore = {version = "0.27.0"}
+sp-keystore = {version = "0.28.0"}
 
 [features]
 default = ["std"]