Bump jszip from 3.9.0 to 3.9.1

Bumps [jszip](https://github.com/Stuk/jszip) from 3.9.0 to 3.9.1.
- [Release notes](https://github.com/Stuk/jszip/releases)
- [Changelog](https://github.com/Stuk/jszip/blob/main/CHANGES.md)
- [Commits](https://github.com/Stuk/jszip/compare/v3.9.0...v3.9.1)

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

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

packages/backend/package.json

@@ -68,7 +68,7 @@
     "form-data": "^4.0.0",
     "formidable": "2.0.1",
     "jsonwebtoken": "8.5.1",
-    "jszip": "3.9.0",
+    "jszip": "3.9.1",
     "mdast-util-to-string": "2",
     "mocha": "^8.3.2",
     "mongodb-memory-server": "^8.3.0",