Bump opentelemetry-otlp from 0.26.0 to 0.31.0

Bumps [opentelemetry-otlp](https://github.com/open-telemetry/opentelemetry-rust) from 0.26.0 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-otlp-0.26.0...v0.31.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -44,7 +44,7 @@ iced = { version = "0.13", features = [
 log.workspace = true
 open = "5"
 opentelemetry = { version = "0.26", features = ["trace"], optional = true }
-opentelemetry-otlp = { version = "0.26", features = [
+opentelemetry-otlp = { version = "0.31", features = [
   "grpc-tonic",
   "trace",
 ], optional = true }