Update soketto requirement from 0.6 to 0.7 (#493)

* Update soketto requirement from 0.6 to 0.7

Updates the requirements on [soketto](https://github.com/paritytech/soketto) to permit the latest version.
- [Release notes](https://github.com/paritytech/soketto/releases)
- [Changelog](https://github.com/paritytech/soketto/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/paritytech/soketto/compare/v0.6.0...v0.7.0

)

---
updated-dependencies:
- dependency-name: soketto
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* set_origin -> set_headers

* fmg

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Maciej Hirsz <[email protected]>