build(deps): bump opentelemetry-otlp from 0.14.0 to 0.15.0

Bumps [opentelemetry-otlp](https://github.com/open-telemetry/opentelemetry-rust) from 0.14.0 to 0.15.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-rust/releases)
- [Commits](open-telemetry/opentelemetry-rust@v0.14.0...v0.15.0)

---
updated-dependencies:
- dependency-name: opentelemetry-otlp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -23,7 +23,7 @@ k8s-openapi = { version = "0.21.1", default-features = false, features = [
 lazy_static = "1.4.0"
 mime = "0.3"
 num_cpus = "1.16.0"
-opentelemetry-otlp = { version = "0.14.0", features = ["metrics", "tonic"] }
+opentelemetry-otlp = { version = "0.15.0", features = ["metrics", "tonic"] }
 opentelemetry = { version = "0.21", default-features = false, features = [
   "metrics",
   "trace",