Bump uvloop from 0.19.0 to 0.20.0 (#490)

Bumps [uvloop](https://github.com/MagicStack/uvloop) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/MagicStack/uvloop/releases)
- [Commits](MagicStack/uvloop@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: uvloop
  dependency-type: direct:development
  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>

pyproject.toml

@@ -63,7 +63,7 @@ pytest-timeout = "^2.3.1"
 requests = "^2.32.3"
 typed-ast = {version="^1.4.0", markers="platform_python_implementation != 'PyPy'"}
 uvicorn = "^0.30.3"
-uvloop = {version="^0.19.0", markers="sys_platform != 'win32' and sys_platform != 'cygwin' and platform_python_implementation != 'PyPy'"}
+uvloop = {version=">=0.19,<0.21", markers="sys_platform != 'win32' and sys_platform != 'cygwin' and platform_python_implementation != 'PyPy'"}
 winloop = {version = "^0.1.6", platform = "win32"}
 
 [build-system]