Bump sanic-testing from 22.6.0 to 23.6.0

Bumps [sanic-testing](https://github.com/sanic-org/sanic-testing) from 22.6.0 to 23.6.0.
- [Release notes](https://github.com/sanic-org/sanic-testing/releases)
- [Commits](sanic-org/sanic-testing@v22.6.0...v23.6.0)

---
updated-dependencies:
- dependency-name: sanic-testing
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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