Bump uvloop from 0.15.3 to 0.16.0

Bumps [uvloop](https://github.com/MagicStack/uvloop) from 0.15.3 to 0.16.0.
- [Release notes](https://github.com/MagicStack/uvloop/releases)
- [Commits](https://github.com/MagicStack/uvloop/compare/v0.15.3...v0.16.0

)

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

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