Update dependency pinyin to ~2.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
pinyin (source)	dependencies	minor	~2.8.0 -> ~2.9.0

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Release Notes

hotoo/pinyin

### [`v2.9.1`](https://togithub.com/hotoo/pinyin/blob/master/CHANGELOG.md#​291-2020-05-03) [Compare Source](https://togithub.com/hotoo/pinyin/compare/2.9.0...2.9.1) - dict: fixed 氓's pinyin dict. [#​272](https://togithub.com/hotoo/pinyin/issues/272) ### [`v2.9.0`](https://togithub.com/hotoo/pinyin/blob/master/CHANGELOG.md#​290-2019-05-09) [Compare Source](https://togithub.com/hotoo/pinyin/compare/2.8.3...2.9.0) - dict: upgrade web pinyin dict. [#​243](https://togithub.com/hotoo/pinyin/issues/243)

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