1.2.1 - Alignment with pytest-harvest 1.2.1

pytest-harvest 1.2 provides default fixtures and fixes a few issues in the synthesis dictionary (in particular fixture and fixture parameters were overlapping each other). We aligned pytest-steps to leverage it.

Also, minor improvement: the unique id internally generated for each test now includes the pytest object. In practice this does not change anything for most use cases, but it might allow later refactoring, and better diagnostics.

See documentation page for details.