compatibility with pytest-dependency

Hi,

first: thank you for the cool tool, it really helps with faster CI pipelines :)

My request: can you make the split algorithm take pytest dependencys into account? We have same test that depend on other test to run first. Currently pytest splits theses into different groups which will result in the tests failing.

Start by locating the test-splitting algorithm and reviewing how pytest-dependency expresses test ordering. Determine how dependent tests should be grouped without breaking the existing balancing behavior, then add coverage for dependency-aware splitting and run the plugin's test suite to confirm dependent tests no longer fail because they were separated.

Written by the indexing model from the issue text.