Bump uvicorn in /{{cookiecutter.project_slug}}/backend (#131)

Bumps [uvicorn](https://github.com/encode/uvicorn) from 0.11.8 to 0.12.1.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/CHANGELOG.md)
- [Commits](Kludex/uvicorn@0.11.8...0.12.1)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

{{cookiecutter.project_slug}}/backend/requirements.txt

@@ -12,7 +12,7 @@ pytest==6.1.0
 requests==2.24.0
 SQLAlchemy==1.3.19
 starlette==0.13.8
-uvicorn==0.11.8
+uvicorn==0.12.1
 passlib==1.7.2
 bcrypt==3.2.0
 sqlalchemy-utils==0.36.8