Bump uvicorn in /{{cookiecutter.project_slug}}/requirements

Bumps [uvicorn](https://github.com/encode/uvicorn) from 0.9.1 to 0.11.7.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/CHANGELOG.md)
- [Commits](https://github.com/encode/uvicorn/compare/0.9.1...0.11.7)

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

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

@@ -1,7 +1,7 @@
 spacy==2.2.0
 fastapi==0.42.0
 requests==2.22.0
-uvicorn==0.9.1
+uvicorn==0.11.7
 python-dotenv==0.10.3
 pytest==5.2.1
 pytest-cov==2.8.1