chore(deps): bump @typespec/http from 1.12.0 to 1.13.0 in /additions

Bumps [@typespec/http](https://github.com/microsoft/typespec) from 1.12.0 to 1.13.0.
- [Release notes](https://github.com/microsoft/typespec/releases)
- [Commits](https://github.com/microsoft/typespec/compare/typespec-stable@1.12.0...typespec-stable@1.13.0)

---
updated-dependencies:
- dependency-name: "@typespec/http"
  dependency-version: 1.13.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]