Bump github.com/pion/dtls/v2 from 2.0.3 to 2.2.4 (#97)

Bumps [github.com/pion/dtls/v2](https://github.com/pion/dtls) from 2.0.3 to 2.2.4.
- [Release notes](https://github.com/pion/dtls/releases)
- [Commits](https://github.com/pion/dtls/compare/v2.0.3...v2.2.4

)

---
updated-dependencies:
- dependency-name: github.com/pion/dtls/v2
  dependency-type: indirect
...

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