Bumps [ruff](https://github.com/astral-sh/ruff) from 0.1.13 to 0.1.14.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@v0.1.13...v0.1.14)

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

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

An import statement in 'stepik_plugins_client/rpcapi.py' was updated to handle the linter warning. Also, rearranged the exceptions list in 'stepic_plugins/exceptions.py' for clarity and ease of use.

The 'black' package was removed from the development dependencies in the 'pyproject.toml' file. This change could be due to it not being required for development anymore, or perhaps it was causing some conflicts.

This commit introduces a new GitHub actions workflow auto-author-assign. This workflow automatically assigns the author to a pull request upon its creation or reopening, using self-hosted runners with a timeout of 30 minutes.

This commit introduces a new auto-format GitHub workflow. This is designed to automatically format code for pull requests and pushes to the 'master' branch, using self-hosted runners with a 30-minute timeout. The code formatting tool used is ruff.