build(deps): 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](https://github.com/matklad/once_cell/compare/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>

Cargo.lock

@@ -950,9 +950,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.20.3"
+version = "1.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "945462a4b81e43c4e3ba96bd7b49d834c6f61198356aa858733bc4acf3cbe62e"
+checksum = "cde51589ab56b20a6f686b2c68f7a0bd6add753d697abf720d63f8db3ab7b1ad"
 
 [[package]]
 name = "oorandom"

Cargo.toml

@@ -98,7 +98,7 @@ natord-plus-plus = "2.0"
 path-clean = "1.0.1"
 number_prefix = "0.4"
 palette = { version = "0.7.6", default-features = false, features = ["std"] }
-once_cell = "1.20.3"
+once_cell = "1.21.0"
 percent-encoding = "2.3.1"
 phf = { version = "0.11.2", features = ["macros"] }
 plist = { version = "1.7.0", default-features = false }