Bump vue-loader from 15.9.7 to 16.3.1

Bumps [vue-loader](https://github.com/vuejs/vue-loader) from 15.9.7 to 16.3.1.
- [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)

---
updated-dependencies:
- dependency-name: vue-loader
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -21,7 +21,7 @@
         "uiv": "^1.2",
         "vue": "^2.6",
         "vue-i18n": "^8.25",
-        "vue-loader": "^15.9.7",
+        "vue-loader": "^16.3.1",
         "vue-template-compiler": "^2.6"
     }
 }