bump networkx to 2.7 to fix intermittent CI failure when torch in…

…stall failed: `ImportError: cannot import name 'Mapping' from 'collections'` (#4116)

* try to bump networkx to 3.0

* lower to 2.3

* 2.7 seem to pass locally, have a more thorough test

* recover pin

pyproject.toml

@@ -57,7 +57,7 @@ dependencies = [
     "joblib>=1",
     "matplotlib>=3.8",
     "monty>=2024.7.29",
-    "networkx>=2.2",
+    "networkx>=2.7",  # PR #4116
     "palettable>=3.3.3",
     "pandas>=2",
     "plotly>=4.5.0",