chore(deps-dev): bump @types/node from 20.19.33 to 26.1.0

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 20.19.33 to 26.1.0.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-version: 26.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/package.json

@@ -41,7 +41,7 @@
     "@types/cors": "^2.8.19",
     "@types/eventsource": "^1.1.15",
     "@types/express": "^5.0.6",
-    "@types/node": "^25.2.3",
+    "@types/node": "^26.1.0",
     "@types/supertest": "^6.0.3",
     "@types/swagger-jsdoc": "^6.0.4",
     "@types/swagger-ui-express": "^4.1.6",

frontend/package.json

@@ -29,7 +29,7 @@
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",
-    "@types/node": "^20",
+    "@types/node": "^26",
     "@types/react": "^19.2.17",
     "@types/react-dom": "^19",
     "@vitejs/plugin-react": "^6.0.2",