Update furo package version to 2025.12.19

Author: adamtheturtle

pyproject.toml

@@ -44,7 +44,7 @@ optional-dependencies.dev = [
     "doccmd==2025.12.13",
     "docformatter==1.7.7",
     "freezegun==1.5.5",
-    "furo==2025.9.25",
+    "furo==2025.12.19",
     "interrogate==1.7.0",
     "mypy[faster-cache]==1.19.1",
     "mypy-strict-kwargs==2025.4.3",