fix(deps): update dependency textlint-rule-no-dropping-the-ra to v2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
textlint-rule-no-dropping-the-ra	^1.1.3 -> ^2.0.0

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Release Notes

textlint-ja/textlint-rule-no-dropping-the-ra

### [`v2.0.0`](https://togithub.com/textlint-ja/textlint-rule-no-dropping-the-ra/releases/v2.0.0) [Compare Source](https://togithub.com/textlint-ja/textlint-rule-no-dropping-the-ra/compare/v1.1.3...v2.0.0) #### Features - "見れる" のら抜き言葉を判定するように [#​4](https://togithub.com/textlint-ja/textlint-rule-no-dropping-the-ra/issues/4)

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