chore(deps): update opn requirement from ^5.2.0 to ^6.0.0

[dependabot-preview]

Updates the requirements on opn to permit the latest version.

Release notes

Sourced from opn's releases.

v6.0.0

Breaking:

• Rename the package from opn to open (See the readme for more info) eca88d8
• Make the wait option false by default da2d663
• Require Node.js 8 5c525b5

Enhancements:

• Add support for Windows apps referenced by their WSL paths (#118) b30220c

sindresorhus/open@v5.5.0...v6.0.0

Commits

• c356917 6.0.0
• eca88d8 Rename the package from opn to open
• 6f68b21 Meta tweaks
• da2d663 Make the wait option false by default
• b30220c Add support for Windows apps referenced by their WSL paths (#118)
• 54fcb34 Fix readme typo (#120)
• 7c55257 Mention related module in the readme
• 5c525b5 Require Node.js 8
• 15caf1c 5.5.0
• 3d2e28b Add note about Electron
• Additional commits viewable in compare view

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[tlancina]

I think the @types/opn release might be messed up, because 5.5.0 says "This is a stub types definition. opn provides its own type definitions, so you do not need this installed.". As far as I can tell it doesn't provide its own types (https://github.com/sindresorhus/open/tree/15caf1c276f1251c9cf8c9cebd40c5ec0681a8c9) which is causing a fresh CLI install to fail on bootstrap with some scary errors (although I think it still emits just fine). If you want to wait on CLI 5.0.0 updating this, maybe we can pin the types to 5.1.0 (the previous version) in the meantime?

[dependabot-preview]

Looks like opn is no longer a dependency, so this is no longer needed.