Bump once_cell from 1.20.3 to 1.21.0

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.20.3 to 1.21.0.
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.20.3...v1.21.0)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -34,7 +34,7 @@ uuid = { version = "1.15", default-features = false, features = [
   "v4",
   "serde",
 ] }
-once_cell = { version = "1.20" }
+once_cell = { version = "1.21" }
 
 http = { version = "1.2" }
 http-body-util = { version = "0.1" }