Update dependency opn to v5

This MR contains the following updates:

Package	Type	Update	Change
opn	devDependencies	major	4.0.2 -> 5.5.0

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Release Notes

sindresorhus/open

v5.5.0

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• Use system xdg-open in Electron apps on Linux (#​108) 6d3f255

v5.4.0

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v5.3.0

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v5.2.0

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v5.1.0

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v5.0.0

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