Bump axios from 1.8.4 to 1.12.2 in /backend (#292)

Bumps [axios](https://github.com/axios/axios) from 1.8.4 to 1.12.2.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Commits](axios/axios@v1.8.4...v1.12.2)

---
updated-dependencies:
- dependency-name: axios
  dependency-version: 1.12.2
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Julian Ammouche Ottosen <42567826+julian-ao@users.noreply.github.com>

Author: dependabot[bot]

backend/package-lock.json

@@ -14,7 +14,7 @@
   "dependencies": {
     "@slack/web-api": "^7.0.4",
     "@supabase/supabase-js": "^2.48.0",
-    "axios": "^1.8.4",
+    "axios": "^1.12.2",
     "cors": "^2.8.5",
     "dotenv": "^16.4.7",
     "express": "^4.21.1",