Update deps and GHA

[ppinchuk]

Bump to latest github actions and pixi.

[Copilot]

Pull request overview

Updates development tooling and GitHub Actions configuration to use newer pinned versions (Ruff, Pixi setup action, Pixi CLI) and to reduce redundant CI runs via workflow concurrency controls.

Changes:

• Bump Ruff to 0.15.15 in both Python optional dev deps and Pixi dev feature deps.
• Update prefix-dev/setup-pixi action pin and Pixi CLI version to v0.69.0 across workflows; bump Release Drafter and CodeQL action pins.
• Add concurrency blocks to multiple workflows to cancel superseded PR runs.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pyproject.toml	Bumps Ruff version constraints for dev tooling (pip extras + Pixi dev env).
crates/revrt/src/cost/components.rs	Refactors a let-chain condition into nested if statements (equivalent logic).
.github/workflows/release-rust.yml	Updates Pixi setup action pin and Pixi version used for Rust release jobs.
.github/workflows/release_drafter.yml	Bumps Release Drafter action pin.
.github/workflows/docs.yml	Adds workflow concurrency; updates Pixi setup action pin and Pixi version for docs build.
.github/workflows/codeql.yml	Adds workflow concurrency; bumps CodeQL action pin.
.github/workflows/codecov.yml	Adds workflow concurrency; updates Pixi setup action pin and Pixi version for coverage run.
.github/workflows/ci-rust.yml	Adds workflow concurrency; updates Pixi setup action pin and Pixi version for Rust CI jobs.
.github/workflows/ci-python.yml	Adds workflow concurrency; updates Pixi setup action pin and Pixi version for Python CI jobs.
.github/workflows/bench.yml	Adds workflow concurrency; updates Pixi setup action pin and Pixi version for benchmarks.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.63%. Comparing base (f137684) to head (0142a84).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #282   +/-   ##
=======================================
  Coverage   96.63%   96.63%           
=======================================
  Files          27       27           
  Lines        3240     3240           
  Branches      391      391           
=======================================
  Hits         3131     3131           
  Misses         61       61           
  Partials       48       48           

Flag	Coverage Δ
unittests	96.63% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.