build(deps-dev): bump black from 25.12.0 to 26.3.0

Bumps [black](https://github.com/psf/black) from 25.12.0 to 26.3.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/compare/25.12.0...26.3.0)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 26.3.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

pyproject.toml

@@ -145,7 +145,7 @@ dev = [
     "flake8-use-pathlib==0.3.0",
     "flake8-copyright==0.2.4",
     "ruff==0.15.0",
-    "black==25.12.0",
+    "black==26.3.0",
     "isort==8.0.0",
     "mypy==1.19.1",
     "mypy-protobuf==5.0.0",