Bump tracing-journald from 0.2.0 to 0.3.0

Bumps [tracing-journald](https://github.com/tokio-rs/tracing) from 0.2.0 to 0.3.0.
- [Release notes](https://github.com/tokio-rs/tracing/releases)
- [Commits](tokio-rs/tracing@tracing-journald-0.2.0...tracing-journald-0.3.0)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -49,7 +49,7 @@ tracing = "0.1"
 tracing-futures = "0.2"
 tracing-gelf = { version = "0.6", optional = true }
 # TODO unpin this when cross for ARM targets is fixed: https://github.com/cross-rs/cross/pull/591
-tracing-journald = { version = "=0.2.0", optional = true }
+tracing-journald = { version = "=0.3.0", optional = true }
 tracing-subscriber = { version = "0.3", features = ["fmt", "json", "time"] }
 tracing-appender = "0.2"
 tokio = { version = "^1.15", features = ["rt-multi-thread", "time", "sync", "rt", "signal", "test-util"] }