Bump npm from 6.13.4 to 6.14.6

Bumps [npm](https://github.com/npm/cli) from 6.13.4 to 6.14.6.
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/v6.14.6/CHANGELOG.md)
- [Commits](npm/cli@v6.13.4...v6.14.6)

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

package.json

@@ -117,7 +117,7 @@
     "mutationobserver-shim": "0.3.3",
     "ngtemplate-loader": "2.0.1",
     "node-sass": "4.13.1",
-    "npm": "6.13.4",
+    "npm": "6.14.6",
     "optimize-css-assets-webpack-plugin": "5.0.1",
     "phantomjs-prebuilt": "2.1.16",
     "pixelmatch": "4.0.2",