Bump qs, express and a11y

Bumps [qs](https://github.com/ljharb/qs) to 6.11.0 and updates ancestor dependencies [qs](https://github.com/ljharb/qs), [express](https://github.com/expressjs/express) and [a11y](https://github.com/addyosmani/a11y). These dependencies need to be updated together.


Updates `qs` from 5.2.1 to 6.11.0
- [Release notes](https://github.com/ljharb/qs/releases)
- [Changelog](https://github.com/ljharb/qs/blob/main/CHANGELOG.md)
- [Commits](ljharb/qs@v5.2.1...v6.11.0)

Updates `express` from 4.17.1 to 4.18.2
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.17.1...4.18.2)

Updates `a11y` from 0.2.6 to 0.5.1
- [Release notes](https://github.com/addyosmani/a11y/releases)
- [Commits](addyosmani/a11y@v0.2.6...v0.5.1)

---
updated-dependencies:
- dependency-name: qs
  dependency-type: indirect
- dependency-name: express
  dependency-type: direct:production
- dependency-name: a11y
  dependency-type: direct:development
...

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