Checkout correct ref in integration tests

[ewanharris]

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Description

As we're using pull_request_target we need to specify the ref to checkout, also use npx to run pretty-quick in husky so that it doesn't need to be installed globally.

This is still going to fail as the issue at hand isn't fixed, but this will allow validating the fix in a PR

References

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Testing

Describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

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• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch