core: bump uvicorn from 0.20.0 to 0.21.0 (#4897)

Bumps [uvicorn](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](https://github.com/encode/uvicorn/compare/0.20.0...0.21.0)

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

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

poetry.lock

@@ -3405,14 +3405,14 @@ files = [
 
 [[package]]
 name = "uvicorn"
-version = "0.20.0"
+version = "0.21.0"
 description = "The lightning-fast ASGI server."
 category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "uvicorn-0.20.0-py3-none-any.whl", hash = "sha256:c3ed1598a5668208723f2bb49336f4509424ad198d6ab2615b7783db58d919fd"},
-    {file = "uvicorn-0.20.0.tar.gz", hash = "sha256:a4e12017b940247f836bc90b72e725d7dfd0c8ed1c51eb365f5ba30d9f5127d8"},
+    {file = "uvicorn-0.21.0-py3-none-any.whl", hash = "sha256:e69e955cb621ae7b75f5590a814a4fcbfb14cb8f44a36dfe3c5c75ab8aee3ad5"},
+    {file = "uvicorn-0.21.0.tar.gz", hash = "sha256:8635a388062222082f4b06225b867b74a7e4ef942124453d4d1d1a5cb3750932"},
 ]
 
 [package.dependencies]