Bump qs from 6.10.3 to 6.12.3 in /ntbs-service

Bumps [qs](https://github.com/ljharb/qs) from 6.10.3 to 6.12.3.
- [Changelog](https://github.com/ljharb/qs/blob/main/CHANGELOG.md)
- [Commits](ljharb/qs@v6.10.3...v6.12.3)

---
updated-dependencies:
- dependency-name: qs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

ntbs-service/package.json

@@ -27,7 +27,7 @@
     "formdata-polyfill": "4.0.10",
     "govuk-frontend": "4.0.1",
     "nhsuk-frontend": "6.1.0",
-    "qs": "6.10.3",
+    "qs": "6.12.3",
     "sass": "1.49.9",
     "url-loader": "4.1.1",
     "vue": "^2.7.14",