[Snyk] Security upgrade url-unshort from 5.0.0 to 6.0.0

[eiurur]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

 #### Changes included in this PR - Changes to the following files to upgrade the vulnerable dependencies to a fixed version: - packages/backend/package.json - packages/backend/package-lock.json #### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **556/1000**
**Why?** Recently disclosed, Has a fix available, CVSS 5.4 | Open Redirect
[SNYK-JS-GOT-2932019](https://snyk.io/vuln/SNYK-JS-GOT-2932019) | Yes | No Known Exploit (*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: url-unshort

The new version differs by 35 commits.

• 442bc5f 6.0.0 released
• 01b7571 Fix got options
• 4dd99c9 Add skipped test
• fa43646 Switch tests to use nock
• ddf1ae1 Fix got status codes, add tests
• 6d3fcb6 Add isErrorFatal function
• 06354f0 Add readme section about errors
• 6b7100f Replace mdurl with URL
• 811c0c8 Deprecate tr.im
• 5c6eaf0 Deprecate thecow.me
• e8e4a2c Deprecate snipurl.com
• 321a97d Update Basic usage demo (#12)
• 7955fdf Docs: styling update
• 88254e2 Added `.remove()` method
• 5942ef9 Docs update
• 162ac9f Split out compilation process
• 4eeab4b `.select` => `.link_selector` & drop `src` attr check
• 7f2b71d Replace all `Promise`-s with async/await
• b95d933 Rewrite UnshortError to es6
• c1c40d6 Fix the rest of redirectors
• e90177f `deepmerge` => `lodash.merge`
• 4be7314 Bump `got`
• 01a8115 assert: use strict methods
• f373f75 Changelog update

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project. ------------ **Note:** *You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.* For more information: 🧐 [View latest project report](https://app.snyk.io/org/eiurur/project/4d1c1fe1-2908-4d62-8873-b1cc23e77f71?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/eiurur/project/4d1c1fe1-2908-4d62-8873-b1cc23e77f71?utm_source=github&utm_medium=referral&page=fix-pr/settings) 📚 [Read more about Snyk's upgrade and patch logic](https://support.snyk.io/hc/en-us/articles/360003891078-Snyk-patches-to-fix-vulnerabilities) [//]: # (snyk:metadata:{"prId":"1f885510-837f-45ef-a200-ea9608aafdbb","prPublicId":"1f885510-837f-45ef-a200-ea9608aafdbb","dependencies":[{"name":"url-unshort","from":"5.0.0","to":"6.0.0"}],"packageManager":"npm","projectPublicId":"4d1c1fe1-2908-4d62-8873-b1cc23e77f71","projectUrl":"https://app.snyk.io/org/eiurur/project/4d1c1fe1-2908-4d62-8873-b1cc23e77f71?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-JS-GOT-2932019"],"upgrade":["SNYK-JS-GOT-2932019"],"isBreakingChange":true,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore","merge-advice-badge-shown"],"priorityScoreList":[556]}) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Open Redirect](https://learn.snyk.io/lessons/open-redirect/javascript?loc=fix-pr)