Bumps [ecdsa](https://github.com/warner/python-ecdsa) from 0.13 to 0.13.3.
- [Release notes](https://github.com/warner/python-ecdsa/releases)
- [Changelog](https://github.com/warner/python-ecdsa/blob/python-ecdsa-0.13.3/NEWS)
- [Commits](warner/python-ecdsa@python-ecdsa-0.13...python-ecdsa-0.13.3)

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