Update versions of dependencies

[nllong]

No description provided.

[Copilot]

Pull Request Overview

This PR modernizes the project's CI/CD infrastructure and development tooling by updating dependencies, configurations, and removing deprecated integrations.

• Updates GitHub Actions workflows to use newer Ubuntu version and Python versions
• Replaces legacy pre-commit tools (isort, autoflake, flake8) with modern Ruff linter/formatter
• Adds Dependabot configuration for automated dependency management

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tox.ini	Removes deprecated Travis CI environment variables
requirements-test.txt	Adds pre-commit dependency
.pre-commit-config.yaml	Updates hook versions and replaces Python linting tools with Ruff
.github/workflows/ci.yml	Updates Ubuntu runner, Python versions, and GitHub Actions versions
.github/dependabot.yml	Adds new Dependabot configuration for automated dependency updates

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