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The previous config allowed rack to be bumped to a higher version (e.g. 3) which introduced errors when running the tests [1] for CI (#1276) and for new users running locally.
This sets the version to no greater than 2.2 as a temporary fix to allow tests to pass, until updates can be made to fix the breaking changes.
[1] https://gds.slack.com/archives/C03D792LYJG/p1718295709926239?thread_ts=1718203657.261269&cid=C03D792LYJG
more context
It looks like the error is thrown by pact_mock-service, which should have introduced compatibility with rack 3+ here pact-foundation/pact-mock_service#146
Stu has raised an issue here pact-foundation/pact-mock_service#151