build(deps): bump idna in /tests/opentelemetry-docker-tests/tests (#4545)

Bumps [idna](https://github.com/kjd/idna) from 2.10 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](https://github.com/kjd/idna/compare/v2.10...v3.7)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.7'
  dependency-type: direct:production
...

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