build(deps-dev): bump the development group across 1 directory with 2 updates

Bumps the development group with 2 updates in the /services/backend directory: [@biomejs/biome](https://github.com/biomejs/biome/tree/HEAD/packages/@biomejs/biome) and [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node).


Updates `@biomejs/biome` from 2.5.13 to 2.5.14
- [Release notes](https://github.com/biomejs/biome/releases)
- [Changelog](https://github.com/biomejs/biome/blob/main/packages/@biomejs/biome/CHANGELOG.md)
- [Commits](https://github.com/biomejs/biome/commits/@biomejs/biome@2.5.14/packages/@biomejs/biome)

Updates `@types/node` from 26.5.1 to 26.6.1
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@biomejs/biome"
  dependency-version: 2.5.14
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development
- dependency-name: "@types/node"
  dependency-version: 26.6.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development
...

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

services/backend/package.json

@@ -35,9 +35,9 @@
     "zod": "^4.6.5"
   },
   "devDependencies": {
-    "@biomejs/biome": "^2.5.13",
+    "@biomejs/biome": "^2.5.14",
     "@types/express": "^5.0.6",
-    "@types/node": "^26.5.1",
+    "@types/node": "^26.6.1",
     "@types/pg": "^8.23.1",
     "@types/ws": "^8.18.1",
     "tsx": "^4.23.13",