Bump log from 0.4.19 to 0.4.20

Bumps [log](https://github.com/rust-lang/log) from 0.4.19 to 0.4.20.
- [Release notes](https://github.com/rust-lang/log/releases)
- [Changelog](https://github.com/rust-lang/log/blob/master/CHANGELOG.md)
- [Commits](rust-lang/log@0.4.19...0.4.20)

---
updated-dependencies:
- dependency-name: log
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -25,7 +25,7 @@ sp-io = { version = "23.0.0", default-features = false, git = "https://github.co
 sp-runtime = { version = "24.0.0", default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v1.0.0" }
 sp-std = { version = "8.0.0", default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v1.0.0" }
 sp-transaction-storage-proof = { version = "4.0.0-dev", default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v1.0.0" }
-log = { version = "0.4.17", default-features = false }
+log = { version = "0.4.20", default-features = false }
 
 [dev-dependencies]
 sp-core = { version = "21.0.0", default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v1.0.0" }