Bump opentelemetry from 0.22.0 to 0.31.0

Bumps [opentelemetry](https://github.com/open-telemetry/opentelemetry-rust) from 0.22.0 to 0.31.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-rust/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/docs/release_0.30.md)
- [Commits](open-telemetry/opentelemetry-rust@opentelemetry-0.22.0...opentelemetry-prometheus-0.31.0)

---
updated-dependencies:
- dependency-name: opentelemetry
  dependency-version: 0.31.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -59,7 +59,7 @@ urlencoding = { version = "2.1", optional = true }
 reqwest = { version = "0.12", optional = true, default-features = false, features = ["json", "rustls-tls"] }
 
 # OpenTelemetry (feature-gated)
-opentelemetry = { version = "0.22", optional = true }
+opentelemetry = { version = "0.31", optional = true }
 opentelemetry_sdk = { version = "0.31", optional = true, features = ["rt-tokio"] }
 opentelemetry-otlp = { version = "0.31", optional = true }
 opentelemetry-semantic-conventions = { version = "0.14", optional = true }