chore(deps): bump opentelemetry from 0.15.0 to 0.16.0

Bumps [opentelemetry](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@v0.15.0...v0.16.0)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -30,7 +30,7 @@ ureq = "2.2"
 num-traits = "0.2"
 num-derive = "0.3"
 display_utils = "0.4.0"
-opentelemetry = { version = "0.15", features = ["serialize", "metrics"] }
+opentelemetry = { version = "0.16", features = ["serialize", "metrics"] }
 bagua-opentelemetry = { path = "../bagua-opentelemetry" }
 
 [dependencies.pyo3]

bagua-core-internal/Cargo.toml

@@ -9,7 +9,7 @@ tracing = "0.1"
 async-std = { version = "1.10", features = ["attributes", "tokio1"] }
 async-trait = { version = "0.1" }
 hyper = { version = "0.14", features = ["full"] }
-opentelemetry = { version = "0.15", default-features = false, features = [
+opentelemetry = { version = "0.16", default-features = false, features = [
     "trace",
     "rt-async-std",
 ] }