[deps] Update responses requirement from ~=0.25.7 to ~=0.25.8

Updates the requirements on [responses](https://github.com/getsentry/responses) to permit the latest version.
- [Release notes](https://github.com/getsentry/responses/releases)
- [Changelog](https://github.com/getsentry/responses/blob/master/CHANGES)
- [Commits](https://github.com/getsentry/responses/compare/0.25.7...0.25.8)

---
updated-dependencies:
- dependency-name: responses
  dependency-version: 0.25.8
  dependency-type: direct:production
...

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