Bump backbone from 1.4.0 to 1.4.1

Bumps [backbone](https://github.com/jashkenas/backbone) from 1.4.0 to 1.4.1.
- [Release notes](https://github.com/jashkenas/backbone/releases)
- [Commits](jashkenas/backbone@1.4.0...1.4.1)

---
updated-dependencies:
- dependency-name: backbone
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Signed-off-by: nextcloud-command <nextcloud-command@users.noreply.github.com>

Author: dependabot[bot]

core/js/dist/login.js

@@ -43,7 +43,7 @@
     "@nextcloud/vue": "^4.2.0",
     "@nextcloud/vue-dashboard": "^2.0.1",
     "autosize": "^5.0.1",
-    "backbone": "^1.4.0",
+    "backbone": "^1.4.1",
     "blueimp-md5": "^2.19.0",
     "bootstrap": "^4.6.1",
     "camelcase": "^6.2.1",