Bump to version 1.8.0

[anmarchenko]

Added

• Add command line tool to compute a percentage of skippable tests for RSpec (#194)

Changed

• Bump gem datadog dependency to 2.4 and update test dependencies (#248)
• Optimise LocalRepository.relative_to_root helper to make test impact analysis faster (#244)
• Retry HTTP requests on 429 and 5xx responses (#243)
• Use correct monotonic clock time if Timecop.mock_process_clock is set (#242)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.78%. Comparing base (9ec713d) to head (4a3a86b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #249 +/- ## ======================================= Coverage 98.78% 98.78% ======================================= Files 285 285 Lines 13766 13766 Branches 656 656 ======================================= Hits 13599 13599 Misses 167 167 ```

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