Bump tokio from 1.6.0 to 1.16.1 in /gamecenter

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.6.0 to 1.16.1.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.6.0...tokio-1.16.1)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: indirect
...

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

Author: dependabot[bot]