Use bump-my-version to bump version

- Use https://github.com/callowayproject/bump-my-version to bump version
- `bumpversion` and `bump2version` are no longer maintained
- `bump-my-version` also supports `citation.cff`
- Also available as a GitHub Actions

After the change, update these files:
- [CONTRIBUTING.md](https://github.com/PyThaiNLP/pythainlp/blob/dev/CONTRIBUTING.md)
- [release.md](https://github.com/PyThaiNLP/pythainlp/blob/dev/release.md)

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Use bump-my-version to bump version #1050

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