build(deps-dev): bump pytest-httpserver from 1.0.10 to 1.0.12

Bumps [pytest-httpserver](https://github.com/csernazs/pytest-httpserver) from 1.0.10 to 1.0.12.
- [Release notes](https://github.com/csernazs/pytest-httpserver/releases)
- [Changelog](https://github.com/csernazs/pytest-httpserver/blob/master/CHANGES.rst)
- [Commits](csernazs/pytest-httpserver@1.0.10...1.0.12)

---
updated-dependencies:
- dependency-name: pytest-httpserver
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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