use `ruff` in place of `flake8`

[zacharyburnett]

ruff is an in-development Python linter written in Rust that aims for parity with combined Flake8 and Black: https://github.com/charliermarsh/ruff

It has several advantages over flake8, including significant speedups in linting and support for pyproject.toml configuration and PEP517 / PEP621.

Checklist for maintainers

• [ ] added entry in CHANGES.rst within the relevant release section
• [ ] updated or added relevant tests
• [ ] updated relevant documentation
• [ ] added relevant milestone
• [ ] added relevant label(s)
• [ ] ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR
• [ ] Make sure the JIRA ticket is resolved properly

[codecov[bot]]

Codecov Report

Base: 79.76% // Head: 79.76% // No change to project coverage :thumbsup:

Coverage data is based on head (3bfe9fc) compared to base (d5d4086). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7054   +/-   ##
=======================================
  Coverage   79.76%   79.76%           
=======================================
  Files         412      412           
  Lines       37576    37576           
=======================================
  Hits        29974    29974           
  Misses       7602     7602           

Flag	Coverage Δ		*Carryforward flag
nightly	79.75% <ø> (ø)		Carriedforward from d5d4086
unit	52.23% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

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