Bump clang-format from 19.1.7 to 21.1.1

Bumps [clang-format](https://github.com/ssciwr/clang-format-wheel) from 19.1.7 to 21.1.1.
- [Release notes](https://github.com/ssciwr/clang-format-wheel/releases)
- [Commits](ssciwr/clang-format-wheel@v19.1.7...v21.1.1)

---
updated-dependencies:
- dependency-name: clang-format
  dependency-version: 21.1.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-lintrunner.txt

@@ -5,4 +5,4 @@ lintrunner-adapters==0.12.4
 # RUFF
 ruff==0.9.5
 # CLANGFORMAT
-clang-format==19.1.7
+clang-format==21.1.1