chore(deps): bump once_cell from 1.19.0 to 1.20.0

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.19.0 to 1.20.0.
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.19.0...v1.20.0)

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

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

Cargo.toml

@@ -17,7 +17,7 @@ humantime = "2.1.0"
 indexmap = { version = "2.5.0", features = ["serde"] }
 nanoid = "0.4.0"
 num-traits = "0.2.19"
-once_cell = "1.19.0"
+once_cell = "1.20.0"
 os_info = { version = "3.8.2", default-features = false }
 paste = "1.0.15"
 poise = { git = "https://github.com/serenity-rs/poise.git", branch = "serenity-next" }