Update dependency electron-packager to v15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
electron-packager	^14.2.1 -> 15.5.1

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Release Notes

electron/electron-packager

v15.5.1

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v15.5.0

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Added

• New universal architecture supported when packaging for macOS to generate a universal app
• osxUniveral option to allow providing options to @electron/universal when packaging a universal app

v15.4.0

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Added

• extendHelperInfo option to allow extending helper app Info.plist files (#​1233)
• Automatically insert ElectronAsarIntegrity into Info.plist files (#​1279)

Fixed

• Compatibility with electron-notarize@^1.1.0 (#​1278)

v15.3.0

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Added

• Bundled app validation to ensure that both package.json and the main entry point exist (#​1257)
• Support for customizing Windows targets on darwin/arm64 (#​1260)
• Support for customizing Windows targets on WSL without Wine installed (#​1260)

v15.2.0

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Added

• Upgrade electron-osx-sign to 0.5.0 which adds a new option, entitlementsForFile (#​1189)

Fixed

• Add package manager lockfiles to default ignore list (#​1182)
• Allow checking official builds against prerelease versions (#​1191)

v15.1.0

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Added

• add darwin/arm64 and mas/arm64 as official platform/arch combinations (#​1168)

Fixed

• TypeScript: ensure OsxNotarizeOptions definition contains credentials (#​1167)

v15.0.0

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Added

• mac: app API key notarization (#​1127)
• TypeScript definition (#​1131)

Changed

• Replace cross-zip with extract-zip (#​1139)

Removed

• Node < 10 support (#​1122)

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