Bump once_cell from 1.20.0 to 1.20.2

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.20.0 to 1.20.2.
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.20.0...v1.20.2)

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

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

Cargo.toml

@@ -30,7 +30,7 @@ async-trait = "0.1.81"
 # Investigate if wither::bson can be used instead and activate this feature.
 bson = { version = "2.10.0", features = ["serde_with", "chrono-0_4"] }
 jsonwebtoken = "9.3.0"
-once_cell = "1.20.0"
+once_cell = "1.20.2"
 bcrypt = "0.15.1"
 validator = { version = "0.18.1", features = ["derive"] }
 mime = "0.3.17"