Bump @snowpack/plugin-webpack from 2.3.1 to 3.0.0

Bumps [@snowpack/plugin-webpack](https://github.com/snowpackjs/snowpack/tree/HEAD/plugins/plugin-webpack) from 2.3.1 to 3.0.0.
- [Release notes](https://github.com/snowpackjs/snowpack/releases)
- [Changelog](https://github.com/snowpackjs/snowpack/blob/main/plugins/plugin-webpack/CHANGELOG.md)
- [Commits](https://github.com/snowpackjs/snowpack/commits/@snowpack/plugin-webpack@3.0.0/plugins/plugin-webpack)

---
updated-dependencies:
- dependency-name: "@snowpack/plugin-webpack"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -50,7 +50,7 @@
     "@jest/types": "^27.0.6",
     "@snowpack/app-scripts-react": "^1.10.0",
     "@snowpack/plugin-postcss": "1.4.3",
-    "@snowpack/plugin-webpack": "2.3.1",
+    "@snowpack/plugin-webpack": "3.0.0",
     "@storybook/addon-actions": "^6.2.9",
     "@storybook/addon-essentials": "^6.1.7",
     "@storybook/addon-info": "^5.3.21",