Bump sanic from 21.12.1 to 21.12.2

Bumps [sanic](https://github.com/sanic-org/sanic) from 21.12.1 to 21.12.2.
- [Release notes](https://github.com/sanic-org/sanic/releases)
- [Changelog](https://github.com/sanic-org/sanic/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/sanic-org/sanic/compare/v21.12.1...v21.12.2)

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

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

pyproject.toml

@@ -9,7 +9,7 @@ license = "MIT"
 python = ">=3.7,<4.0"
 mpv = "^0.1" # TODO: do we use this?
 youtube_dl = "^2021.12.17"
-sanic = "^21.6.2"
+sanic = "^21.12.2"
 sanic-openapi = "^21.6.1"
 
 [tool.poetry.dev-dependencies]