chore(deps): update minor and patch for gatsby-graphiql-explorer

[wardpeet]

This PR contains the following updates:

Package	Type	Update	Change
webpack	devDependencies	patch	^4.44.1 -> ^4.44.2
whatwg-fetch	devDependencies	patch	^3.4.0 -> ^3.4.1

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Release Notes

webpack/webpack

### [`v4.44.2`](https://togithub.com/webpack/webpack/releases/v4.44.2) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.44.1...v4.44.2) ### Bugfixes - make sure to generate correct chunk connection for blocks that are only connected in some runtimes - fixes a bug where filename contains undefined hash at runtime

github/fetch

### [`v3.4.1`](https://togithub.com/github/fetch/releases/v3.4.1) [Compare Source](https://togithub.com/github/fetch/compare/v3.4.0...v3.4.1) Republishing to ensure the dist/fetch.umd.js is up-to-date

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