Bump tracing-subscriber from 0.3.8 to 0.3.9

Bumps [tracing-subscriber](https://github.com/tokio-rs/tracing) from 0.3.8 to 0.3.9.
- [Release notes](https://github.com/tokio-rs/tracing/releases)
- [Commits](https://github.com/tokio-rs/tracing/compare/tracing-subscriber-0.3.8...tracing-subscriber-0.3.9)

---
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.lock

@@ -2019,9 +2019,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.3.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74786ce43333fcf51efe947aed9718fbe46d5c7328ec3f1029e818083966d9aa"
+checksum = "9e0ab7bdc962035a87fba73f3acca9b8a8d0034c2e6f60b84aeaaddddc155dce"
 dependencies = [
  "ansi_term",
  "lazy_static",

Cargo.toml

@@ -33,7 +33,7 @@ tracing-actix-web = "0.5.0-rc.3"
 tracing-bunyan-formatter = "0.3.2"
 tracing-futures = "0.2.5"
 tracing-log = "0.1.2"
-tracing-subscriber = { version = "0.3.8", features = ["registry", "env-filter"] }
+tracing-subscriber = { version = "0.3.9", features = ["registry", "env-filter"] }
 
 [build-dependencies]
 ructe = "0.14.0"