fix(deps): update dependency opn to v6

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
opn	^5.3.0 -> ^6.0.0

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Release Notes

sindresorhus/open (opn)

### [`v6.0.0`](https://togithub.com/sindresorhus/open/releases/tag/v6.0.0) [Compare Source](https://togithub.com/sindresorhus/open/compare/v5.5.0...v6.0.0) Breaking: - Rename the package from `opn` to `open` (See the readme for more info) [`eca88d8`](https://togithub.com/sindresorhus/open/commit/eca88d8) - Make the `wait` option `false` by default [`da2d663`](https://togithub.com/sindresorhus/open/commit/da2d663) - Require Node.js 8 [`5c525b5`](https://togithub.com/sindresorhus/open/commit/5c525b5) Enhancements: - Add support for Windows apps referenced by their WSL paths ([#​118](https://togithub.com/sindresorhus/open/issues/118)) [`b30220c`](https://togithub.com/sindresorhus/open/commit/b30220c)

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