fix: stop :get, :delete parameters from bleeding into subsequent requests

[stevehobbsdev]

Changes

This change means that parameters supplied to a :get or :delete request in RestClient should no longer bleed into subsequent calls, as the shared headers hash is no longer mutated by these calls.

This fix has caused some of the integration test fixtures to no longer match requests being made, so these have also been updated.

References

Fixes #344

Testing

Please 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.

• This change adds unit test coverage
• This change adds integration test coverage
• This change has been tested on the latest version of Ruby

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors
• Rubocop passes on all added/modified files
• All active GitHub checks have passed

[stevehobbsdev]

Moving to draft until I fix the build.

[Widcket]

👏🏼