Bump on-headers and serve

Bumps [on-headers](https://github.com/jshttp/on-headers) to 1.1.0 and updates ancestor dependency [serve](https://github.com/vercel/serve). These dependencies need to be updated together.


Updates `on-headers` from 1.0.2 to 1.1.0
- [Release notes](https://github.com/jshttp/on-headers/releases)
- [Changelog](https://github.com/jshttp/on-headers/blob/master/HISTORY.md)
- [Commits](jshttp/on-headers@v1.0.2...v1.1.0)

Updates `serve` from 14.1.2 to 14.2.6
- [Release notes](https://github.com/vercel/serve/releases)
- [Changelog](https://github.com/vercel/serve/blob/main/CHANGELOG.md)
- [Commits](vercel/serve@14.1.2...v14.2.6)

---
updated-dependencies:
- dependency-name: on-headers
  dependency-version: 1.1.0
  dependency-type: indirect
- dependency-name: serve
  dependency-version: 14.2.6
  dependency-type: direct:development
...

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

Author: dependabot[bot]