build(deps): bump tracing-subscriber from 0.2.14 to 0.2.15

Bumps [tracing-subscriber](https://github.com/tokio-rs/tracing) from 0.2.14 to 0.2.15.
- [Release notes](https://github.com/tokio-rs/tracing/releases)
- [Commits](https://github.com/tokio-rs/tracing/compare/tracing-subscriber-0.2.14...tracing-subscriber-0.2.15)

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

Cargo.lock

@@ -2252,9 +2252,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.2.14"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2810660b9d5b18895d140caba6401765749a6a162e5d0736cfc44ea50db9d79d"
+checksum = "a1fa8f0c8f4c594e4fc9debc1990deab13238077271ba84dd853d54902ee3401"
 dependencies = [
  "ansi_term 0.12.1",
  "chrono",