Bump tracing-subscriber from 0.3.7 to 0.3.8

Bumps [tracing-subscriber](https://github.com/tokio-rs/tracing) from 0.3.7 to 0.3.8.
- [Release notes](https://github.com/tokio-rs/tracing/releases)
- [Commits](https://github.com/tokio-rs/tracing/compare/tracing-subscriber-0.3.7...tracing-subscriber-0.3.8)

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

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

Cargo.toml

@@ -26,7 +26,7 @@ shrinkwraprs = "0.3.0"
 validator = { version = "0.14", features = ["derive"] }
 webfinger = "0.4.1"
 tracing = "0.1.30"
-tracing-subscriber = "0.3.5"
+tracing-subscriber = "0.3.8"
 riker = "0.4.2"
 
 [[bin]]