Bump tracing-subscriber from 0.3.3 to 0.3.4

Bumps [tracing-subscriber](https://github.com/tokio-rs/tracing) from 0.3.3 to 0.3.4.
- [Release notes](https://github.com/tokio-rs/tracing/releases)
- [Commits](https://github.com/tokio-rs/tracing/compare/tracing-subscriber-0.3.3...tracing-subscriber-0.3.4)

---
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

@@ -2160,9 +2160,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.3.3"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "245da694cc7fc4729f3f418b304cb57789f1bed2a78c575407ab8a23f53cb4d3"
+checksum = "d5e6136799e1079699e0d9784c883e03af55cf6a1bee48fe1d79ca552c1bc36f"
 dependencies = [
  "ansi_term",
  "lazy_static",

Cargo.toml

@@ -33,7 +33,7 @@ tracing-actix-web = "0.4.0-beta.14"
 tracing-bunyan-formatter = "0.3.1"
 tracing-futures = "0.2.5"
 tracing-log = "0.1.2"
-tracing-subscriber = { version = "0.3.3", features = ["registry", "env-filter"] }
+tracing-subscriber = { version = "0.3.4", features = ["registry", "env-filter"] }
 
 [build-dependencies]
 ructe = "0.13.4"