Bump opentelemetry-exporter-jaeger from 1.15.0 to 1.21.0

Bumps [opentelemetry-exporter-jaeger](https://github.com/open-telemetry/opentelemetry-python) from 1.15.0 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@v1.15.0...v1.21.0)

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

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