build(deps-dev): bump ruff in /tests/ocpp-server in the regular group

build(deps-dev): bump ruff in /tests/ocpp-server in the regular group

Bumps the regular group in /tests/ocpp-server with 1 update: [ruff](https://github.com/astral-sh/ruff).

Updates `ruff` from 0.11.2 to 0.11.3
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](https://github.com/astral-sh/ruff/compare/0.11.2...0.11.3)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.11.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: regular
...

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