Update devDependencies

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@wordpress/scripts	12.2.1 -> 12.6.0
file-loader	6.1.0 -> 6.2.0

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Release Notes

WordPress/gutenberg

### [`v12.6.0`](https://togithub.com/WordPress/gutenberg/compare/@wordpress/scripts@12.5.0...@wordpress/scripts@12.6.0) [Compare Source](https://togithub.com/WordPress/gutenberg/compare/@wordpress/scripts@12.5.0...@wordpress/scripts@12.6.0) ### [`v12.5.0`](https://togithub.com/WordPress/gutenberg/compare/@wordpress/scripts@12.4.0...@wordpress/scripts@12.5.0) [Compare Source](https://togithub.com/WordPress/gutenberg/compare/@wordpress/scripts@12.4.0...@wordpress/scripts@12.5.0) ### [`v12.4.0`](https://togithub.com/WordPress/gutenberg/compare/@wordpress/scripts@12.3.0...@wordpress/scripts@12.4.0) [Compare Source](https://togithub.com/WordPress/gutenberg/compare/@wordpress/scripts@12.3.0...@wordpress/scripts@12.4.0) ### [`v12.3.0`](https://togithub.com/WordPress/gutenberg/compare/@wordpress/scripts@12.2.1...@wordpress/scripts@12.3.0) [Compare Source](https://togithub.com/WordPress/gutenberg/compare/@wordpress/scripts@12.2.1...@wordpress/scripts@12.3.0)

webpack-contrib/file-loader

### [`v6.2.0`](https://togithub.com/webpack-contrib/file-loader/blob/master/CHANGELOG.md#​620-httpsgithubcomwebpack-contribfile-loadercomparev611v620-2020-10-27) [Compare Source](https://togithub.com/webpack-contrib/file-loader/compare/v6.1.1...v6.2.0) ##### Features - added the `sourceFilename` property to asset info with original filename ([#​393](https://togithub.com/webpack-contrib/file-loader/issues/393)) ([654e0d6](https://togithub.com/webpack-contrib/file-loader/commit/654e0d641ec067089f6a2d12e30ec3520f00d808)) ##### Bug Fixes - immutable flag when the `name` option have hash in query string ([#​392](https://togithub.com/webpack-contrib/file-loader/issues/392)) ([381d8bd](https://togithub.com/webpack-contrib/file-loader/commit/381d8bda3f2494487bfe840386e365b97b6025fe)) ##### [6.1.1](https://togithub.com/webpack-contrib/file-loader/compare/v6.1.0...v6.1.1) (2020-10-09) ##### Chore - update `schema-utils` ### [`v6.1.1`](https://togithub.com/webpack-contrib/file-loader/blob/master/CHANGELOG.md#​611-httpsgithubcomwebpack-contribfile-loadercomparev610v611-2020-10-09) [Compare Source](https://togithub.com/webpack-contrib/file-loader/compare/v6.1.0...v6.1.1)

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