Bump opentelemetry-otlp from 0.15.0 to 0.16.0

Bumps [opentelemetry-otlp](https://github.com/open-telemetry/opentelemetry-rust) from 0.15.0 to 0.16.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-rust/releases)
- [Commits](open-telemetry/opentelemetry-rust@opentelemetry-otlp-0.15.0...opentelemetry-otlp-0.16.0)

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

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

notegraf-web/Cargo.toml

@@ -32,7 +32,7 @@ tracing-log = "0.2"
 lazy_static = "1.4"
 opentelemetry = "0.22"
 opentelemetry_sdk = { version = "0.22", features = ["rt-tokio-current-thread"] }
-opentelemetry-otlp = "0.15"
+opentelemetry-otlp = "0.16"
 tokio = { version = "1.37", features = ["macros", "sync", "rt-multi-thread"] }
 notegraf = {version = "0.1.1", path = "../notegraf"}
 sqlx = { version = "0.7", features = ["postgres"] }