chore(deps-dev): bump opentelemetry-sdk from 1.20.0 to 1.21.0

Bumps [opentelemetry-sdk](https://github.com/open-telemetry/opentelemetry-python) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-python/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-python/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-python@v1.20.0...v1.21.0)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -62,7 +62,7 @@ multidict==6.0.4
 
 opentelemetry-api==1.20.0
 
-opentelemetry-sdk==1.20.0
+opentelemetry-sdk==1.21.0
 
 opentelemetry-semantic-conventions==0.41b0