Bump to v2.3.1 (#177)

oscarhiggott · web-flow · commit e27b8c6a5f5b · 2025-09-25T12:26:34.000-07:00
diff --git a/src/pymatching/_version.py b/src/pymatching/_version.py
@@ -1 +1 @@
-__version__ = "2.3.dev1"    # pragma no cover
+__version__ = "2.3.1"    # pragma no cover
