Bump tracing from 0.1.30 to 0.1.31 (#4941)

Bumps [tracing](https://github.com/tokio-rs/tracing) from 0.1.30 to 0.1.31.
- [Release notes](https://github.com/tokio-rs/tracing/releases)
- [Commits](https://github.com/tokio-rs/tracing/compare/tracing-0.1.30...tracing-0.1.31)

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

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

polkadot/node/core/runtime-api/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 
 [dependencies]
 futures = "0.3.21"
-tracing = "0.1.30"
+tracing = "0.1.31"
 memory-lru = "0.1.0"
 parity-util-mem = { version = "0.10.0", default-features = false }