⬆️ Bump uvicorn[standard] from 0.20.0 to 0.21.0 (#174)

Bumps [uvicorn[standard]](https://github.com/encode/uvicorn) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/CHANGELOG.md)
- [Commits](encode/uvicorn@0.20.0...0.21.0)

---
updated-dependencies:
- dependency-name: uvicorn[standard]
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docker-images/requirements.txt

@@ -1,2 +1,2 @@
-uvicorn[standard]==0.20.0
+uvicorn[standard]==0.21.0
 gunicorn==20.1.0