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.lock

@@ -2047,9 +2047,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.3.7"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5312f325fe3588e277415f5a6cca1f4ccad0f248c4cd5a4bd33032d7286abc22"
+checksum = "74786ce43333fcf51efe947aed9718fbe46d5c7328ec3f1029e818083966d9aa"
 dependencies = [
  "ansi_term",
  "lazy_static",

Cargo.toml

@@ -33,7 +33,7 @@ tracing-actix-web = "0.5.0-rc.1"
 tracing-bunyan-formatter = "0.3.2"
 tracing-futures = "0.2.5"
 tracing-log = "0.1.2"
-tracing-subscriber = { version = "0.3.7", features = ["registry", "env-filter"] }
+tracing-subscriber = { version = "0.3.8", features = ["registry", "env-filter"] }
 
 [build-dependencies]
 ructe = "0.13.4"