build: Bump once_cell from 1.15.0 to 1.16.0

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.15.0 to 1.16.0.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matklad/once_cell/compare/v1.15.0...v1.16.0)

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

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

test_infra/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2021"
 dirs = "4.0.0"
 epoll = "4.3.1"
 libc = "0.2.137"
-once_cell = "1.15.0"
+once_cell = "1.16.0"
 serde = { version = "1.0.147", features = ["rc", "derive"] }
 serde_json = "1.0.87"
 ssh2 = { version = "0.9.3", features = ["vendored-openssl"] }