fix(deps): update minor and patch dependencies for gatsby-plugin-sharp

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
async (source)	^3.2.5 -> ^3.2.6
debug	^4.3.4 -> ^4.3.7

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Release Notes

caolan/async (async)

### [`v3.2.6`](https://redirect.github.com/caolan/async/compare/v3.2.5...v3.2.6) [Compare Source](https://redirect.github.com/caolan/async/compare/v3.2.5...v3.2.6)

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