Update dependency gatsby-background-image to v0.9.11

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby-background-image	dependencies	patch	0.9.10 -> 0.9.11

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Release Notes

timhagn/gatsby-background-image

### [`v0.9.11`](https://togithub.com/timhagn/gatsby-background-image/compare/v0.9.10...v0.9.11) [Compare Source](https://togithub.com/timhagn/gatsby-background-image/compare/v0.9.10...v0.9.11)

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