Bump webpack-subresource-integrity in /frontend-adminpanel

Bumps [webpack-subresource-integrity](https://github.com/waysact/webpack-subresource-integrity) from 1.1.0-rc.4 to 1.5.2.
- [Release notes](https://github.com/waysact/webpack-subresource-integrity/releases)
- [Changelog](https://github.com/waysact/webpack-subresource-integrity/blob/master/CHANGELOG.md)
- [Commits](waysact/webpack-subresource-integrity@v1.1.0-rc.4...v1.5.2)

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