chore(deps): update minor and patch for gatsby-legacy-polyfills

[wardpeet]

This PR contains the following updates:

Package	Type	Update	Change
execa	devDependencies	patch	^4.0.2 -> ^4.0.3
microbundle	devDependencies	patch	^0.12.0 -> ^0.12.3
url-polyfill	devDependencies	patch	^1.1.9 -> ^1.1.10
whatwg-fetch	devDependencies	patch	^3.4.0 -> ^3.4.1

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Release Notes

sindresorhus/execa

### [`v4.0.3`](https://togithub.com/sindresorhus/execa/releases/v4.0.3) [Compare Source](https://togithub.com/sindresorhus/execa/compare/v4.0.2...v4.0.3) - Fix use of floating number for the `timeout` and `forceKillAfterTimeout` options ([#​431](https://togithub.com/sindresorhus/execa/issues/431)) [`9a157b3`](https://togithub.com/sindresorhus/execa/commit/9a157b3)

developit/microbundle

### [`v0.12.3`](https://togithub.com/developit/microbundle/releases/0.12.3) [Compare Source](https://togithub.com/developit/microbundle/compare/0.12.2...0.12.3) ##### Features & Improvements - New `onStart`, `onError` callbacks for programmatic Microbundle usage! ([#​668](https://togithub.com/developit/microbundle/issues/668), thanks [@​katywings](https://togithub.com/katywings)!) - allow multi-file output and code splitting ([#​674](https://togithub.com/developit/microbundle/issues/674), thanks [@​katywings](https://togithub.com/katywings)!) - Strip comments from output ([#​548](https://togithub.com/developit/microbundle/issues/548)) ##### Bug Fixes - don't mark `--alias` modules as externals ([#​671](https://togithub.com/developit/microbundle/issues/671), thanks [@​katywings](https://togithub.com/katywings)!) ### [`v0.12.2`](https://togithub.com/developit/microbundle/releases/0.12.2) [Compare Source](https://togithub.com/developit/microbundle/compare/0.12.1...0.12.2) - Updated Babel and `preset-env` to 7.10 ([#​660](https://togithub.com/developit/microbundle/issues/660)) - Fixed an version conflict caused by multiple copies of Babel ([#​664](https://togithub.com/developit/microbundle/issues/664)) - Fixed `globals` generation when `--external` values include dashes ([#​667](https://togithub.com/developit/microbundle/issues/667), thanks [@​katywings](https://togithub.com/katywings)!) ### [`v0.12.1`](https://togithub.com/developit/microbundle/releases/0.12.1) [Compare Source](https://togithub.com/developit/microbundle/compare/0.12.0...0.12.1) ##### Features - New `--no-pkg-main` option for disabling filename inference ([#​658](https://togithub.com/developit/microbundle/issues/658), thanks [@​katywings](https://togithub.com/katywings)) - Allow the use of `import.meta` ([#​627](https://togithub.com/developit/microbundle/issues/627), thanks [@​developit](https://togithub.com/developit)) ##### Bugfixes - Fix non-alphanumeric values for `--external` ([#​650](https://togithub.com/developit/microbundle/issues/650), thanks [@​katywings](https://togithub.com/katywings)) - Preserve comments when `--no-compress` is enabled ([#​648](https://togithub.com/developit/microbundle/issues/648), thanks [@​developit](https://togithub.com/developit)) - Fix TypeScript issue when "module" is set to "CommonJS" ([#​638](https://togithub.com/developit/microbundle/issues/638), thanks [@​marvinhagemeister](https://togithub.com/marvinhagemeister)) - Fix TypeScript declaration emit target ([#​629](https://togithub.com/developit/microbundle/issues/629), thanks [@​marvinhagemeister](https://togithub.com/marvinhagemeister)) - Fix TypeScript `declarationDir` option so it respects the cwd ([#​643](https://togithub.com/developit/microbundle/issues/643)) ([#​646](https://togithub.com/developit/microbundle/issues/646), thanks [@​katywings](https://togithub.com/katywings)) - Fix TypeScript Fragments breaking when jsxFactory is set ([#​623](https://togithub.com/developit/microbundle/issues/623), thanks [@​marvinhagemeister](https://togithub.com/marvinhagemeister)) ##### General Improvements - Dependency updates ([#​634](https://togithub.com/developit/microbundle/issues/634) [#​616](https://togithub.com/developit/microbundle/issues/616), thanks [@​teodragovic](https://togithub.com/teodragovic), [@​merceyz](https://togithub.com/merceyz)) - Documentation updates for 0.12 and `--externals` ([#​636](https://togithub.com/developit/microbundle/issues/636) [#​628](https://togithub.com/developit/microbundle/issues/628) [#​625](https://togithub.com/developit/microbundle/issues/625) [#​609](https://togithub.com/developit/microbundle/issues/609) [#​611](https://togithub.com/developit/microbundle/issues/611) [#​614](https://togithub.com/developit/microbundle/issues/614), thanks [@​gtrufitt](https://togithub.com/gtrufitt), [@​developit](https://togithub.com/developit), [@​SeanBannister](https://togithub.com/SeanBannister), [@​adrienpoly](https://togithub.com/adrienpoly) & [@​i-like-robots](https://togithub.com/i-like-robots))

lifaon74/url-polyfill

### [`v1.1.10`](https://togithub.com/lifaon74/url-polyfill/compare/786963381db78c52e183fa4d99c5e82da163af23...75c2deb52c40f252bd6cc75b4e2aaf0ead837a11) [Compare Source](https://togithub.com/lifaon74/url-polyfill/compare/786963381db78c52e183fa4d99c5e82da163af23...75c2deb52c40f252bd6cc75b4e2aaf0ead837a11)

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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