Update opentelemetry-otlp requirement from 0.16 to 0.25

Updates the requirements on [opentelemetry-otlp](https://github.com/open-telemetry/opentelemetry-rust) to permit the latest version.
- [Release notes](https://github.com/open-telemetry/opentelemetry-rust/releases)
- [Commits](open-telemetry/opentelemetry-rust@opentelemetry-otlp-0.16.0...opentelemetry-otlp-0.25.0)

---
updated-dependencies:
- dependency-name: opentelemetry-otlp
  dependency-type: direct:production
...

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

Cargo.toml

@@ -31,7 +31,7 @@ serde = "1.0"
 actix-web = { version = "4.0", features = ["macros"] }
 actix-web-opentelemetry = { path = ".", features = ["metrics-prometheus", "sync-middleware", "awc"] }
 opentelemetry_sdk = { version = "0.24", features = ["metrics", "rt-tokio-current-thread"] }
-opentelemetry-otlp = "0.17"
+opentelemetry-otlp = "0.25"
 opentelemetry-stdout = { version = "0.5", features = ["trace", "metrics"] }
 
 [package.metadata.docs.rs]