Bump sanic-testing from 0.8.3 to 23.12.0

Bumps [sanic-testing](https://github.com/sanic-org/sanic-testing) from 0.8.3 to 23.12.0.
- [Release notes](https://github.com/sanic-org/sanic-testing/releases)
- [Commits](sanic-org/sanic-testing@v0.8.3...v23.12.0)

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

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

requirements-dev.txt

@@ -1,4 +1,4 @@
 nose==1.3.7
 aiohttp==3.9.1
 nose-cov
-sanic-testing==0.8.3
+sanic-testing==23.12.0