build(deps-dev): bump the minor-and-patch group in /backend with 4 updates

Bumps the minor-and-patch group in /backend with 4 updates: [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node), [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8), [tsx](https://github.com/privatenumber/tsx) and [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest).


Updates `@types/node` from 25.6.2 to 25.8.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

Updates `@vitest/coverage-v8` from 4.1.5 to 4.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.6/packages/coverage-v8)

Updates `tsx` from 4.21.0 to 4.22.1
- [Release notes](https://github.com/privatenumber/tsx/releases)
- [Changelog](https://github.com/privatenumber/tsx/blob/master/release.config.cjs)
- [Commits](https://github.com/privatenumber/tsx/compare/v4.21.0...v4.22.1)

Updates `vitest` from 4.1.5 to 4.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.6/packages/vitest)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-version: 25.8.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: minor-and-patch
- dependency-name: "@vitest/coverage-v8"
  dependency-version: 4.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: minor-and-patch
- dependency-name: tsx
  dependency-version: 4.22.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: minor-and-patch
- dependency-name: vitest
  dependency-version: 4.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: minor-and-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/package.json

@@ -41,14 +41,14 @@
   },
   "devDependencies": {
     "@biomejs/biome": "^2.4.15",
-    "@types/node": "^25.6.2",
+    "@types/node": "^25.8.0",
     "@types/nodemailer": "^8.0.0",
     "@types/supertest": "^7.2.0",
-    "@vitest/coverage-v8": "^4.1.5",
+    "@vitest/coverage-v8": "^4.1.6",
     "drizzle-kit": "^0.31.10",
     "pino-pretty": "^13.1.3",
     "supertest": "^7.2.2",
-    "tsx": "^4.19.0",
+    "tsx": "^4.22.1",
     "typescript": "^6.0.3",
     "vitest": "^4.0.16"
   },