Unable to use binaries option to sign additional binaries

[voldemortensen]

Preflight Checklist

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• I have searched the issue tracker for a bug that matches the one I want to file, without success.

Issue Details

• Electron Packager Version:
  • Not relevant
• Electron Version:
  • Not relevant
• Operating System:
  • Not relevant
• Last Known Working Electron Packager version::
  • Not relevant

Expected Behavior

I should be able to use binaries in osxSign to sign additional binaries.

Actual Behavior

The TypeScript definition explicitly removes the binaries key using Omit which results in this error:

forge.config.ts:15:7 - error TS2322: Type '{ binaries: string[]; optionsForFile: () => { entitlements: string; }; }' is not assignable to type 'true | OsxSignOptions'.
  Object literal may only specify known properties, and 'binaries' does not exist in type 'OsxSignOptions'.

To Reproduce

const config: ForgeConfig = {
  ...
  packagerConfig: {
    osxSign: {
      binaries: ["./path/to/extra/binary"],
    },
  },
};

Additional Information

binaries has been omitted since the OsxSignOptions type was introduced in a2a3ae5

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