Bump tokio from 1.5.0 to 1.6.0 in /oak_functions/loader
Bump tokio from 1.5.0 to 1.6.0 in /oak_functions/loader

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.5.0...tokio-1.6.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak