Bump opentelemetry_sdk from 0.26.0 to 0.28.0

Bumps [opentelemetry_sdk](https://github.com/open-telemetry/opentelemetry-rust) from 0.26.0 to 0.28.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-rust/releases)
- [Commits](open-telemetry/opentelemetry-rust@opentelemetry_sdk-0.26.0...opentelemetry_sdk-0.28.0)

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

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

Cargo.toml

@@ -35,7 +35,7 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 tracing-log = "0.2"
 lazy_static = "1.5"
 opentelemetry = "0.26"
-opentelemetry_sdk = { version = "0.26", features = ["rt-tokio-current-thread"] }
+opentelemetry_sdk = { version = "0.28", features = ["rt-tokio-current-thread"] }
 opentelemetry-otlp = "0.26"
 tokio = { version = "1.41", features = ["macros", "sync", "rt-multi-thread"] }