update to version 0.8

[AndGem]

• switched edge length computation to the haversine formula for numerical stability over short distances
• fixed a broken network-type selection branch in run.py
• fixed a missing default for OSMWay.max_speed_int
• removed a bare except and a redundant file close() call
• networkx is now installable as an optional extra: pip install OsmToRoadGraph[networkx]
• test suite now runs cleanly with or without the optional networkx dependency
• tooling cleanup: replaced black with ruff format, consolidated dev dependencies, CI now lints with ruff