Bump ecdsa from 0.17.0 to 0.19.0

Bumps [ecdsa](https://github.com/tlsfuzzer/python-ecdsa) from 0.17.0 to 0.19.0.
- [Release notes](https://github.com/tlsfuzzer/python-ecdsa/releases)
- [Changelog](https://github.com/tlsfuzzer/python-ecdsa/blob/master/NEWS)
- [Commits](tlsfuzzer/python-ecdsa@python-ecdsa-0.17.0...python-ecdsa-0.19.0)

---
updated-dependencies:
- dependency-name: ecdsa
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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