chore: Pin pytest version lower than 8.0.0

[r-leyshon]

Description

Patch to avoid fail due to CallSpec2 AttributeError originating from pytest-8.0.0

Fixes #244

Motivation and Context

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Advice for reviewer

Error originating from current api breaking change. I presume it to be linked to our parametrized testing. Not much current chatter about this change right now from my casual googling.

Implementation in pytest 7.4.4:

@final
@dataclasses.dataclass(frozen=True)
class CallSpec2:
    """A planned parameterized invocation of a test function.

    Calculated during collection for a given test function's Metafunc.
    Once collection is over, each callspec is turned into a single Item
    and stored in item.callspec.
    """

    # arg name -> arg value which will be passed to the parametrized test
    # function (direct parameterization).
    funcargs: Dict[str, object] = dataclasses.field(default_factory=dict)
    # arg name -> arg value which will be passed to a fixture of the same name
    # (indirect parametrization).
    params: Dict[str, object] = dataclasses.field(default_factory=dict)
    # arg name -> arg index.
    indices: Dict[str, int] = dataclasses.field(default_factory=dict)
    # Used for sorting parametrized resources.
    _arg2scope: Dict[str, Scope] = dataclasses.field(default_factory=dict)
    # Parts which will be added to the item's name in `[..]` separated by "-".
    _idlist: List[str] = dataclasses.field(default_factory=list)
    # Marks which will be applied to the item.
    marks: List[Mark] = dataclasses.field(default_factory=list)

[ethan-moss]

LGTM! Thanks for looking into this, i'm sure the debugging wasn't easy or clear!

FYI, I've raised an extra issue (#246) to capture the fact that we need to migrate to pytest v8 at some point.