Bump vue-loader from 15.9.6 to 15.9.7

Bumps [vue-loader](https://github.com/vuejs/vue-loader) from 15.9.6 to 15.9.7.
- [Release notes](https://github.com/vuejs/vue-loader/releases)
- [Changelog](https://github.com/vuejs/vue-loader/blob/master/CHANGELOG.md)
- [Commits](vuejs/vue-loader@v15.9.6...v15.9.7)

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

package.json

@@ -123,7 +123,7 @@
     "sinon-chai": "^3.7.0",
     "style-loader": "^2.0.0",
     "url-loader": "^4.1.1",
-    "vue-loader": "^15.9.6",
+    "vue-loader": "^15.9.7",
     "vue-template-compiler": "^2.6.12",
     "webpack": "^4.46.0",
     "webpack-cli": "^4.6.0",