Bump vue-loader from 15.4.2 to 15.5.1
Bump vue-loader from 15.4.2 to 15.5.1

Bumps [vue-loader](https://github.com/vuejs/vue-loader) from 15.4.2 to 15.5.1.
- [Release notes](https://github.com/vuejs/vue-loader/releases)
- [Changelog](https://github.com/vuejs/vue-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-loader/commits/v15.5.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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