Update dependency backbone to v1.4.1

[ghost]

This PR contains the following updates:

Package	Type	Update	Change
backbone	dependencies	minor	1.1.0 -> 1.4.1

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Release Notes

jashkenas/backbone

v1.4.1

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v1.4.0

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v1.3.3

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v1.3.2

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v1.3.1

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v1.2.3

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v1.2.2

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v1.2.1

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v1.2.0

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v1.1.2

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v1.1.1

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Configuration

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