Update dependency electron-packager to v15.5.1

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
electron-packager	15.4.0 -> 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

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