chore(deps-dev): bump @storybook/builder-webpack5

Bumps [@storybook/builder-webpack5](https://github.com/storybookjs/storybook/tree/HEAD/lib/core) from 6.2.0-beta.1 to 6.2.0-rc.4.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v6.2.0-rc.4/lib/core)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -76,7 +76,7 @@
     "@storybook/addon-storyshots-puppeteer": "6.2.0-beta.5",
     "@storybook/addon-storysource": "6.2.0-rc.2",
     "@storybook/addons": "6.2.0-rc.4",
-    "@storybook/builder-webpack5": "6.2.0-beta.1",
+    "@storybook/builder-webpack5": "6.2.0-rc.4",
     "@storybook/client-api": "6.2.0-rc.2",
     "@storybook/core": "6.2.0-rc.4",
     "@storybook/html": "6.2.0-rc.4",