build: bump clang-tidy from 21.1.1 to 21.1.6 in the clang-tools group

Bumps the clang-tools group with 1 update: [clang-tidy](https://github.com/ssciwr/clang-tidy-wheel).


Updates `clang-tidy` from 21.1.1 to 21.1.6
- [Commits](https://github.com/ssciwr/clang-tidy-wheel/commits)

---
updated-dependencies:
- dependency-name: clang-tidy
  dependency-version: 21.1.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: clang-tools
...

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

Author: dependabot[bot]

pyproject.toml

@@ -35,7 +35,7 @@ dependencies = [
     "tomli>=1.1.0; python_version < '3.11'",
     "setuptools>=45.0.0", # Required for pkg_resources in clang-tidy
     "clang-format==21.1.6",
-    "clang-tidy==21.1.1",
+    "clang-tidy==21.1.6",
 ]
 dynamic = ["version"]