chore: Bump once_cell from 1.15.0 to 1.16.0 (#1213)

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](matklad/once_cell@v1.15.0...v1.16.0)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

cli/Cargo.toml

@@ -16,7 +16,7 @@ path = "src/main.rs"
 check-if-email-exists = { path = "../core" }
 clap = { version = "3.2", features = ["derive", "env"] }
 env_logger = "0.9"
-once_cell = "1.15"
+once_cell = "1.16"
 openssl = { version = "0.10", features = ["vendored"] }
 serde = "1.0"
 serde_json = "1.0"